
In MU's history, the Elf Tree once stood in Noria. Essentially, the tree still stands to this day, but now relocated. The Elf Tree was created by the Queen of all Elves, known as Aria. This tree, a sacred ancient monument, had the ability to produce Elves regularly.
Unfortunately, with time, Secrarium learned of the tree's great ability. Through dishonest tactics, he tricked Lugard into revealing the location of the Elf Tree. Having set his eyes on the tree's power of birth, Secrarium corrupted the tree and transformed it into what is now called the Immoral Tree. The Immoral Tree, now corrupt, gives birth to monsters.
The monsters horde grew to astronomical proportions, and the kingdoms of the MU continent had to combine their forces to entrap the Immoral Tree in a space of nothingness, where monsters could not escape. Monsters continued to spawn at regular intervals, from the tree, however after careful consideration Aria decided to make it a training arena for travelers.
Enter as one of 10 MUtizens to engage the forces of Kundun as they spawn in front of you in a endless barrage of attacks. Either alone or in a team only the strongest will survive the Devils Square. With the Devils Invitation, you are granted access into the Devils Square, where your strength will be tested.
Main Mission: Kill monsters and survive.
When the event starts the monsters will instantly spawn all over the arena.
You just have to kill monsters.
Monsters will continue to spawn over 15 minutes.
As the time progresses, the monsters which spawn will change and their difficulty will slightly increase.
To enter the Devil Square, you need a Devil Square Invitation and go to Noria to talk to the NPC Charon which will send you to the event map and you must talk to the same NPC Charon.
Another way to enter is through the command window, if you press M and select Event Square you will be teleported to the event map where you can enter the main Mu events and in turn, you can enter the "Event Square" through the notification icon when the event is available.
Only the first 10 players who show the Devil Square Invitation to the NPC Charon can enter.

Devil Square Invitation
Item used to enter the Devil Square
Admission Notification
A Notification Icon will appear when the event is available for entry.
The Event Icon will be displayed on the game screen when it is available for entry and will disappear when its entry time expires.
You will move to the "Event Square" by clicking on the event notification icon.

Charon
[Location]
Noria: (172, 106)

Charon
[Location]
Event Square: (223, 92)
| Devil Square | Character Level Season 15 or higher |
|---|---|
| 1 | 50 ~ 399 |
| 2 | 400 ~ 599 |
| 3 | 600 ~ 699 |
| 4 | 700 ~ 799 |
| 5 | 800 ~ 899 |
| 6 | 900 ~ 999 |
| 7 | 1000 ~ |
To get the Devil Square Invitation you must go to the Chaos Goblin Machine and select the "Regular Combination" option and enter the following items.
Required Combination Material:
1 Devil's Key
1 Devil's Eye
1 Jewel of Chaos
Zen
* Only items of the same level can be combined to create the Devil Square Invitation for that specific Devil Square.
Probability: It depends on the level of the invitation.
Successful Result: Devil Square Invitation.
Failed Result: All items will be destroyed.

Chaos Goblin Machine
[Location]
Noria: 180, 102

Devil's Eye
You can get this item by hunting monsters or by buying it from NPC 'Lumen the Barmaid'

Devil's Key
You can get this item by hunting monsters or by buying it from NPC 'Lumen the Barmaid'
| Devil Square | Success Rate | Items | Zen |
|---|---|---|---|
| 1 | 75% | Devil's Key +1 & Devil's Eye +1 | 100.000 |
| 2 | 70% | Devil's Key +2 & Devil's Eye +2 | 200.000 |
| 3 | 65% | Devil's Key +3 & Devil's Eye +3 | 400.000 |
| 4 | 60% | Devil's Key +4 & Devil's Eye +4 | 700.000 |
| 5 | 55% | Devil's Key +5 & Devil's Eye +5 | 1.100.000 |
| 6 | 50% | Devil's Key +6 & Devil's Eye +6 | 1.600.000 |
| 7 | 45% | Devil's Key +7 & Devil's Eye +7 | 2.000.000 |
| Item | Monster Level Drop |
|---|---|
| Devil's Key +1 & Devil's Eye +1 | Level 3 |
| Devil's Key +2 & Devil's Eye +2 | Level 36 |
| Devil's Key +3 & Devil's Eye +3 | Level 47 |
| Devil's Key +4 & Devil's Eye +4 | Level 60 |
| Devil's Key +5 & Devil's Eye +5 | Level 70 |
| Devil's Key +6 & Devil's Eye +6 | Level 80 |
| Devil's Key +7 & Devil's Eye +7 | Level 90 |
The event reward is Experience.
The higher you are in the ranking, the more experience you will receive.
You need to get the most event points.
Event points are earned by killing monsters.
You must survive the event in order to be ranked and receive the reward.
In addition to the above, a "Mastery Box" is added.
Only the Master Level of the events can get the compensation.
The "Mastery Box" contains the new currency, Ruud Items and other items.
How to get the Mastery Box:
According to the points obtained in the events you can obtain a Mastery Box.
The reward will be paid at the end in the "Gremory Case" System.
- If you participate individually, you must kill monsters.
- If you participate in party, you must kill monsters.
There are 3 Types of Mastery Box.

Mastery Box (Low)

Mastery Box (Intermediate)

Mastery Box (Advanced)
Event Duration: 15 minutes
Minimum Players: 1
Maximum Players: 10
The Devil's Square Invitation will be removed from your inventory when you enter Devil Square.
Each character can play this event a limit of 6 times per day. (It may be different on unofficial servers)
If you die in Devil Square you will not lose experience, zen or drop items.
If the character has 'PK status', they will not be able to enter the Devil Square.
Party is allowed and can be formed inside the Devil Square.
The warp command can be used after entering the Devil Square.
The player who uses 'Town portal scroll' in Devil Square will return to Noria.
Players remaining in Devil Square after its completion will be returned to Noria.
PVP is not allowed.
In order to do a Sub Quest you must go to the NPC Shadow Phantom Soldier and according to your level complete the mission.
Sub quests can only be done 1 time.
| Level | Quest Name | Quest Requirements | Reward |
|---|---|---|---|
| 50-399 | Listen to the Devil Square Description | Press F1 to see the time of Devil Square 1 | - |
| Get the supplies for Devil Square | Kill 40 Cursed Lich located in Elbeland | Devil's Invitation +1 | |
| Gain 50 points in Devil Square! | Achieve 50 points in Devil Square 1 | 100.000 Zen | |
| Clear Devil Square! | Kill the monsters and survive the Devil Square 1 | 100.000 Exp 200.000 Zen | |
| 400-599 | Listen to the Devil Square Description | Press F1 to see the time of Devil Square 2 | - |
| Get the supplies for Devil Square | Kill 60 Death Cows located in Losttower | Devil's Invitation +2 | |
| Gain 100 points in Devil Square! | Achieve 100 points in Devil Square 2 | 200.000 Zen | |
| Clear Devil Square! | Kill the monsters and survive the Devil Square 2 | 400.000 Exp 300.000 Zen | |
| 600-699 | Get the supplies for Devil Square | Kill 80 Alquamos located in Icarus | Devil's Invitation +3 |
| Gain 130 points in Devil Square! | Achieve 130 points in Devil Square 3 | 800.000 Exp 500.000 Zen | |
| Clear Devil Square! | Kill the monsters and survive the Devil Square 3 | 1.000.000 Exp 1 Jewel of Chaos | |
| 700-799 | Get the supplies for Devil Square | Kill 80 Iron Wheels located in Tarkan | Devil's Invitation +4 |
| Gain 160 points in Devil Square! | Achieve 160 points in Devil Square 4 | 1 Jewel of Chaos 500.000 Zen | |
| Clear Devil Square! | Kill the monsters and survive the Devil Square 4 | 1 Jewel of Soul | |
| 800-899 | Get the supplies for Devil Square | Kill 100 Beam Knights located in Tarkan 2 | Devil's Invitation +5 |
| Gain 190 points in Devil Square! | Achieve 190 points in Devil Square 5 | 1 Jewel of Soul | |
| Clear Devil Square! | Kill the monsters and survive the Devil Square 5 | 1 Jewel of Bless | |
| 900-999 | Get the supplies for Devil Square | Kill 120 Ice Walkers located in La Cleon | Devil's Invitation +6 |
| Gain 210 points in Devil Square! | Achieve 210 points in Devil Square 6 | 1 Jewel of Bless | |
| Clear Devil Square! | Kill the monsters and survive the Devil Square 6 | 1 Jewel of Life | |
| 1000 ~ | Get the supplies for Devil Square | Kill 140 Shadow Knights located in Swamp of Peace | Devil's Invitation +7 |
| Gain 240 points in Devil Square! | Achieve 240 points in Devil Square 7 | 2 Jewel of Soul | |
| Clear Devil Square! | Kill the monsters and survive the Devil Square 7 | 2 Jewel of Bless |

Level 28
Health: 850
Min/Max Attack: 100 ~ 105
Defense: 35
Defense Success Rate: 35

Level 34
Health: 1100
Min/Max Attack: 115 ~ 120
Defense: 45
Defense Success Rate: 41

Level 38
Health: 1400
Min/Max Attack: 125 ~ 130
Defense: 55
Defense Success Rate: 45

Level 40
Health: 1600
Min/Max Attack: 130 ~ 135
Defense: 60
Defense Success Rate: 47

Level 46
Health: 2500
Min/Max Attack: 145 ~ 150
Defense: 75
Defense Success Rate: 61

Level 47
Health: 2800
Min/Max Attack: 148 ~ 153
Defense: 78
Defense Success Rate: 67

Level 55
Health: 6000
Min/Max Attack: 165 ~ 175
Defense: 100
Defense Success Rate: 82

Level 57
Health: 4500
Min/Max Attack: 170 ~ 180
Defense: 110
Defense Success Rate: 85

Level 60
Health: 5000
Min/Max Attack: 180 ~ 195
Defense: 115
Defense Success Rate: 88

Level 64
Health: 6000
Min/Max Attack: 200 ~ 210
Defense: 130
Defense Success Rate: 94

Level ?
Health: ?
Min/Max Attack: ? ~ ?
Defense: ?
Defense Success Rate: ?

Level 70
Health: 10000
Min/Max Attack: 220 ~ 250
Defense: 170
Defense Success Rate: 350

Level 74
Health: 14000
Min/Max Attack: 260 ~ 290
Defense: 190
Defense Success Rate: 400

Level 77
Health: 26000
Min/Max Attack: 300 ~ 360
Defense: 220
Defense Success Rate: 385

Level 75
Health: 11500
Min/Max Attack: 255 ~ 290
Defense: 195
Defense Success Rate: 125

Level 76
Health: 13500
Min/Max Attack: 260 ~ 300
Defense: 200
Defense Success Rate: 130

Level 74
Health: 12000
Min/Max Attack: 270 ~ 295
Defense: 185
Defense Success Rate: 120

Level 78
Health: 15000
Min/Max Attack: 270 ~ 320
Defense: 210
Defense Success Rate: 140

Level 84
Health: 25000
Min/Max Attack: 375 ~ 425
Defense: 275
Defense Success Rate: 190

Level 86
Health: 29000
Min/Max Attack: 425 ~ 480
Defense: 305
Defense Success Rate: 210

Level 102
Health: 55000
Min/Max Attack: 560 ~ 600
Defense: 550
Defense Success Rate: 310

Level 78
Health: 15000
Min/Max Attack: 270 ~ 320
Defense: 210
Defense Success Rate: 140

Level 80
Health: 17500
Min/Max Attack: 290 ~ 340
Defense: 220
Defense Success Rate: 150

Level 83
Health: 20000
Min/Max Attack: 310 ~ 370
Defense: 235
Defense Success Rate: 160

Level 84
Health: 25000
Min/Max Attack: 375 ~ 425
Defense: 275
Defense Success Rate: 190

Level 92
Health: 34500
Min/Max Attack: 489 ~ 540
Defense: 360
Defense Success Rate: 240

Level 92
Health: 37000
Min/Max Attack: 500 ~ 560
Defense: 365
Defense Success Rate: 240

Level 100
Health: 50000
Min/Max Attack: 600 ~ 625
Defense: 500
Defense Success Rate: 780

Level 111
Health: 78000
Min/Max Attack: 705 ~ 755
Defense: 560
Defense Success Rate: 340

Level 114
Health: 83000
Min/Max Attack: 720 ~ 770
Defense: 575
Defense Success Rate: 375

Level 119
Health: 94000
Min/Max Attack: 946 ~ 996
Defense: 783
Defense Success Rate: 905

Level 123
Health: 184370
Min/Max Attack: 915 ~ 990
Defense: 543
Defense Success Rate: 755

Level 129
Health: 218500
Min/Max Attack: 1240 ~ 1375
Defense: 715
Defense Success Rate: 990

Level 131
Health: 218000
Min/Max Attack: 1441 ~ 2017
Defense: 670
Defense Success Rate: 875

Level 135
Health: 100000
Min/Max Attack: 800 ~ 800
Defense: 650
Defense Success Rate: 370

Level 107
Health: 52000
Min/Max Attack: 670 ~ 720
Defense: 525
Defense Success Rate: 303

Level 117
Health: 90000
Min/Max Attack: 735 ~ 790
Defense: 610
Defense Success Rate: 405

Level 120
Health: 96000
Min/Max Attack: 750 ~ 815
Defense: 640
Defense Success Rate: 425

Level 126
Health: 198500
Min/Max Attack: 970 ~ 1005
Defense: 570
Defense Success Rate: 920

Level 128
Health: 203000
Min/Max Attack: 1046 ~ 1181
Defense: 630
Defense Success Rate: 750

Level 131
Health: 218000
Min/Max Attack: 1441 ~ 2017
Defense: 670
Defense Success Rate: 875

Level 135
Health: 230000
Min/Max Attack: 1585 ~ 2060
Defense: 730
Defense Success Rate: 903

Level 111
Health: 78000
Min/Max Attack: 705 ~ 755
Defense: 560
Defense Success Rate: 340

Level 114
Health: 83000
Min/Max Attack: 720 ~ 770
Defense: 575
Defense Success Rate: 375

Level 119
Health: 94000
Min/Max Attack: 946 ~ 996
Defense: 783
Defense Success Rate: 905

Level 123
Health: 184370
Min/Max Attack: 915 ~ 990
Defense: 543
Defense Success Rate: 755

Level 129
Health: 218500
Min/Max Attack: 1240 ~ 1375
Defense: 715
Defense Success Rate: 990

Level 131
Health: 218000
Min/Max Attack: 1441 ~ 2017
Defense: 670
Defense Success Rate: 875

Level 137
Health: 242000
Min/Max Attack: 1743 ~ 2092
Defense: 700
Defense Success Rate: 990

In MU's history, the Elf Tree once stood in Noria. Essentially, the tree still stands to this day, but now relocated. The Elf Tree was created by the Queen of all Elves, known as Aria. This tree, a sacred ancient monument, had the ability to produce Elves regularly.
Unfortunately, with time, Secrarium learned of the tree's great ability. Through dishonest tactics, he tricked Lugard into revealing the location of the Elf Tree. Having set his eyes on the tree's power of birth, Secrarium corrupted the tree and transformed it into what is now called the Immoral Tree. The Immoral Tree, now corrupt, gives birth to monsters.
The monsters horde grew to astronomical proportions, and the kingdoms of the MU continent had to combine their forces to entrap the Immoral Tree in a space of nothingness, where monsters could not escape. Monsters continued to spawn at regular intervals, from the tree, however after careful consideration Aria decided to make it a training arena for travelers.
Enter as one of 10 MUtizens to engage the forces of Kundun as they spawn in front of you in a endless barrage of attacks. Either alone or in a team only the strongest will survive the Devils Square. With the Devils Invitation, you are granted access into the Devils Square, where your strength will be tested.
Main Mission: Kill monsters and survive.
When the event starts the monsters will instantly spawn all over the arena.
You just have to kill monsters.
Monsters will continue to spawn over 15 minutes.
As the time progresses, the monsters which spawn will change and their difficulty will slightly increase.
To enter the Devil Square, you need a Devil Square Invitation and go to Noria to talk to the NPC Charon which will send you to the event map and you must talk to the same NPC Charon.
Another way to enter is through the command window, if you press M and select Event Square you will be teleported to the event map where you can enter the main Mu events and in turn, you can enter the "Event Square" through the notification icon when the event is available.
Only the first 10 players who show the Devil Square Invitation to the NPC Charon can enter.

Devil Square Invitation
Item used to enter the Devil Square
Admission Notification
A Notification Icon will appear when the event is available for entry.
The Event Icon will be displayed on the game screen when it is available for entry and will disappear when its entry time expires.
You will move to the "Event Square" by clicking on the event notification icon.

Charon
[Location]
Noria: (172, 106)

Charon
[Location]
Event Square: (223, 92)
| Devil Square | Character Level Season 10 - Season 11 | Character Level Season 12 - Season 13 - Season 14 |
|---|---|---|
| 1 | 50 ~ 179 | 50 ~ 199 |
| 2 | 180 ~ 269 | 200 ~ 299 |
| 3 | 270 ~ 349 | 300 ~ 399 |
| 4 | 350 ~ 399 | 400 ~ 549 |
| 5 | 400 ~ 500 | 550 ~ 649 |
| 6 | 501 ~ 650 | 650 ~ 769 |
| 7 | 651 ~ | 770 ~ |
To get the Devil Square Invitation you must go to the Chaos Goblin Machine and select the "Regular Combination" option and enter the following items.
Required Combination Material:
1 Devil's Key
1 Devil's Eye
1 Jewel of Chaos
Zen
* Only items of the same level can be combined to create the Devil Square Invitation for that specific Devil Square.
Probability: It depends on the level of the invitation.
Successful Result: Devil Square Invitation.
Failed Result: All items will be destroyed.

Chaos Goblin Machine
[Location]
Noria: 180, 102

Devil's Eye
You can get this item by hunting monsters or by buying it from NPC 'Lumen the Barmaid'

Devil's Key
You can get this item by hunting monsters or by buying it from NPC 'Lumen the Barmaid'
| Devil Square | Success Rate | Items | Zen |
|---|---|---|---|
| 1 | 75% | Devil's Key +1 & Devil's Eye +1 | 100.000 |
| 2 | 70% | Devil's Key +2 & Devil's Eye +2 | 200.000 |
| 3 | 65% | Devil's Key +3 & Devil's Eye +3 | 400.000 |
| 4 | 60% | Devil's Key +4 & Devil's Eye +4 | 700.000 |
| 5 | 55% | Devil's Key +5 & Devil's Eye +5 | 1.100.000 |
| 6 | 50% | Devil's Key +6 & Devil's Eye +6 | 1.600.000 |
| 7 | 45% | Devil's Key +7 & Devil's Eye +7 | 2.000.000 |
| Item | Monster Level Drop |
|---|---|
| Devil's Key +1 & Devil's Eye +1 | Level 3 |
| Devil's Key +2 & Devil's Eye +2 | Level 36 |
| Devil's Key +3 & Devil's Eye +3 | Level 47 |
| Devil's Key +4 & Devil's Eye +4 | Level 60 |
| Devil's Key +5 & Devil's Eye +5 | Level 70 |
| Devil's Key +6 & Devil's Eye +6 | Level 80 |
| Devil's Key +7 & Devil's Eye +7 | Level 90 |
The event reward is Experience.
The higher you are in the ranking, the more experience you will receive.
You need to get the most event points.
Event points are earned by killing monsters.
You must survive the event in order to be ranked and receive the reward.
In addition to the above, a "Mastery Box" is added.
Only the Master Level of the events can get the compensation.
The "Mastery Box" contains the new currency, Ruud Items and other items.
How to get the Mastery Box:
According to the points obtained in the events you can obtain a Mastery Box.
The reward will be paid at the end in the "Gremory Case" System.
- If you participate individually, you must kill monsters.
- If you participate in party, you must kill monsters.
There are 3 Types of Mastery Box.

Mastery Box (Low)

Mastery Box (Intermediate)

Mastery Box (Advanced)
Event Duration: 15 minutes
Minimum Players: 1
Maximum Players: 10
The Devil's Square Invitation will be removed from your inventory when you enter Devil Square.
Each character can play this event a limit of 6 times per day. (It may be different on unofficial servers)
If you die in Devil Square you will not lose experience, zen or drop items.
If the character has 'PK status', they will not be able to enter the Devil Square.
Party is allowed and can be formed inside the Devil Square.
The warp command can be used after entering the Devil Square.
The player who uses 'Town portal scroll' in Devil Square will return to Noria.
Players remaining in Devil Square after its completion will be returned to Noria.
PVP is not allowed.
In order to do a Sub Quest you must go to the NPC Shadow Phantom Soldier and according to your level complete the mission.
Sub quests can only be done 1 time.
Season 10 & Season 11.
Season 12, Season 13 & Season 14.
| Level | Quest Name | Quest Requirements | Reward | |
|---|---|---|---|---|
| 50-179 | 50-199 | Listen to the Devil Square Description | Press F1 to see the time of Devil Square 1 | - |
| Get the supplies for Devil Square | Kill 40 Cursed Lich located in Elbeland | Devil's Invitation +1 | ||
| Gain 50 points in Devil Square! | Achieve 50 points in Devil Square 1 | 100.000 Zen | ||
| Clear Devil Square! | Kill the monsters and survive the Devil Square 1 | 100.000 Exp 200.000 Zen | ||
| 180-269 | 200-299 | Listen to the Devil Square Description | Press F1 to see the time of Devil Square 2 | - |
| Get the supplies for Devil Square | Kill 60 Death Cows located in Losttower | Devil's Invitation +2 | ||
| Gain 100 points in Devil Square! | Achieve 100 points in Devil Square 2 | 200.000 Zen | ||
| Clear Devil Square! | Kill the monsters and survive the Devil Square 2 | 400.000 Exp 300.000 Zen | ||
| 270-349 | 300-399 | Get the supplies for Devil Square | Kill 80 Alquamos located in Icarus | Devil's Invitation +3 |
| Gain 130 points in Devil Square! | Achieve 130 points in Devil Square 3 | 800.000 Exp 500.000 Zen | ||
| Clear Devil Square! | Kill the monsters and survive the Devil Square 3 | 1.000.000 Exp 1 Jewel of Chaos | ||
| 350-399 | 400-549 | Get the supplies for Devil Square | Kill 80 Iron Wheels located in Tarkan | Devil's Invitation +4 |
| Gain 160 points in Devil Square! | Achieve 160 points in Devil Square 4 | 1 Jewel of Chaos 500.000 Zen | ||
| Clear Devil Square! | Kill the monsters and survive the Devil Square 4 | 1 Jewel of Soul | ||
| 400-500 | 550-649 | Get the supplies for Devil Square | Kill 100 Beam Knights located in Tarkan 2 | Devil's Invitation +5 |
| Gain 190 points in Devil Square! | Achieve 190 points in Devil Square 5 | 1 Jewel of Soul | ||
| Clear Devil Square! | Kill the monsters and survive the Devil Square 5 | 1 Jewel of Bless | ||
| 501-650 | 650-769 | Get the supplies for Devil Square | Kill 120 Ice Walkers located in La Cleon | Devil's Invitation +6 |
| Gain 210 points in Devil Square! | Achieve 210 points in Devil Square 6 | 1 Jewel of Bless | ||
| Clear Devil Square! | Kill the monsters and survive the Devil Square 6 | 1 Jewel of Life | ||
| 651 ~ | 770 ~ | Get the supplies for Devil Square | Kill 140 Shadow Knights located in Swamp of Peace | Devil's Invitation +7 |
| Gain 240 points in Devil Square! | Achieve 240 points in Devil Square 7 | 2 Jewel of Soul | ||
| Clear Devil Square! | Kill the monsters and survive the Devil Square 7 | 2 Jewel of Bless | ||

Level 28
Health: 850
Min/Max Attack: 100 ~ 105
Defense: 35
Defense Success Rate: 35

Level 34
Health: 1100
Min/Max Attack: 115 ~ 120
Defense: 45
Defense Success Rate: 41

Level 38
Health: 1400
Min/Max Attack: 125 ~ 130
Defense: 55
Defense Success Rate: 45

Level 40
Health: 1600
Min/Max Attack: 130 ~ 135
Defense: 60
Defense Success Rate: 47

Level 46
Health: 2500
Min/Max Attack: 145 ~ 150
Defense: 75
Defense Success Rate: 61

Level 47
Health: 2800
Min/Max Attack: 148 ~ 153
Defense: 78
Defense Success Rate: 67

Level 55
Health: 6000
Min/Max Attack: 165 ~ 175
Defense: 100
Defense Success Rate: 82

Level 57
Health: 4500
Min/Max Attack: 170 ~ 180
Defense: 110
Defense Success Rate: 85

Level 60
Health: 5000
Min/Max Attack: 180 ~ 195
Defense: 115
Defense Success Rate: 88

Level 64
Health: 6000
Min/Max Attack: 200 ~ 210
Defense: 130
Defense Success Rate: 94

Level ?
Health: ?
Min/Max Attack: ? ~ ?
Defense: ?
Defense Success Rate: ?

Level 70
Health: 10000
Min/Max Attack: 220 ~ 250
Defense: 170
Defense Success Rate: 350

Level 74
Health: 14000
Min/Max Attack: 260 ~ 290
Defense: 190
Defense Success Rate: 400

Level 77
Health: 26000
Min/Max Attack: 300 ~ 360
Defense: 220
Defense Success Rate: 385

Level 75
Health: 11500
Min/Max Attack: 255 ~ 290
Defense: 195
Defense Success Rate: 125

Level 76
Health: 13500
Min/Max Attack: 260 ~ 300
Defense: 200
Defense Success Rate: 130

Level 74
Health: 12000
Min/Max Attack: 270 ~ 295
Defense: 185
Defense Success Rate: 120

Level 78
Health: 15000
Min/Max Attack: 270 ~ 320
Defense: 210
Defense Success Rate: 140

Level 84
Health: 25000
Min/Max Attack: 375 ~ 425
Defense: 275
Defense Success Rate: 190

Level 86
Health: 29000
Min/Max Attack: 425 ~ 480
Defense: 305
Defense Success Rate: 210

Level 102
Health: 55000
Min/Max Attack: 560 ~ 600
Defense: 550
Defense Success Rate: 310

Level 78
Health: 15000
Min/Max Attack: 270 ~ 320
Defense: 210
Defense Success Rate: 140

Level 80
Health: 17500
Min/Max Attack: 290 ~ 340
Defense: 220
Defense Success Rate: 150

Level 83
Health: 20000
Min/Max Attack: 310 ~ 370
Defense: 235
Defense Success Rate: 160

Level 84
Health: 25000
Min/Max Attack: 375 ~ 425
Defense: 275
Defense Success Rate: 190

Level 92
Health: 34500
Min/Max Attack: 489 ~ 540
Defense: 360
Defense Success Rate: 240

Level 92
Health: 37000
Min/Max Attack: 500 ~ 560
Defense: 365
Defense Success Rate: 240

Level 100
Health: 50000
Min/Max Attack: 600 ~ 625
Defense: 500
Defense Success Rate: 780

Level 111
Health: 78000
Min/Max Attack: 705 ~ 755
Defense: 560
Defense Success Rate: 340

Level 114
Health: 83000
Min/Max Attack: 720 ~ 770
Defense: 575
Defense Success Rate: 375

Level 119
Health: 94000
Min/Max Attack: 946 ~ 996
Defense: 783
Defense Success Rate: 905

Level 123
Health: 184370
Min/Max Attack: 915 ~ 990
Defense: 543
Defense Success Rate: 755

Level 129
Health: 218500
Min/Max Attack: 1240 ~ 1375
Defense: 715
Defense Success Rate: 990

Level 131
Health: 218000
Min/Max Attack: 1441 ~ 2017
Defense: 670
Defense Success Rate: 875

Level 135
Health: 100000
Min/Max Attack: 800 ~ 800
Defense: 650
Defense Success Rate: 370

Level 107
Health: 52000
Min/Max Attack: 670 ~ 720
Defense: 525
Defense Success Rate: 303

Level 117
Health: 90000
Min/Max Attack: 735 ~ 790
Defense: 610
Defense Success Rate: 405

Level 120
Health: 96000
Min/Max Attack: 750 ~ 815
Defense: 640
Defense Success Rate: 425

Level 126
Health: 198500
Min/Max Attack: 970 ~ 1005
Defense: 570
Defense Success Rate: 920

Level 128
Health: 203000
Min/Max Attack: 1046 ~ 1181
Defense: 630
Defense Success Rate: 750

Level 131
Health: 218000
Min/Max Attack: 1441 ~ 2017
Defense: 670
Defense Success Rate: 875

Level 135
Health: 230000
Min/Max Attack: 1585 ~ 2060
Defense: 730
Defense Success Rate: 903

Level 111
Health: 78000
Min/Max Attack: 705 ~ 755
Defense: 560
Defense Success Rate: 340

Level 114
Health: 83000
Min/Max Attack: 720 ~ 770
Defense: 575
Defense Success Rate: 375

Level 119
Health: 94000
Min/Max Attack: 946 ~ 996
Defense: 783
Defense Success Rate: 905

Level 123
Health: 184370
Min/Max Attack: 915 ~ 990
Defense: 543
Defense Success Rate: 755

Level 129
Health: 218500
Min/Max Attack: 1240 ~ 1375
Defense: 715
Defense Success Rate: 990

Level 131
Health: 218000
Min/Max Attack: 1441 ~ 2017
Defense: 670
Defense Success Rate: 875

Level 137
Health: 242000
Min/Max Attack: 1743 ~ 2092
Defense: 700
Defense Success Rate: 990

In MU's history, the Elf Tree once stood in Noria. Essentially, the tree still stands to this day, but now relocated. The Elf Tree was created by the Queen of all Elves, known as Aria. This tree, a sacred ancient monument, had the ability to produce Elves regularly.
Unfortunately, with time, Secrarium learned of the tree's great ability. Through dishonest tactics, he tricked Lugard into revealing the location of the Elf Tree. Having set his eyes on the tree's power of birth, Secrarium corrupted the tree and transformed it into what is now called the Immoral Tree. The Immoral Tree, now corrupt, gives birth to monsters.
The monsters horde grew to astronomical proportions, and the kingdoms of the MU continent had to combine their forces to entrap the Immoral Tree in a space of nothingness, where monsters could not escape. Monsters continued to spawn at regular intervals, from the tree, however after careful consideration Aria decided to make it a training arena for travelers.
Enter as one of 10 MUtizens to engage the forces of Kundun as they spawn in front of you in a endless barrage of attacks. Either alone or in a team only the strongest will survive the Devils Square. With the Devils Invitation, you are granted access into the Devils Square, where your strength will be tested.
Main Mission: Kill monsters and survive.
When the event starts the monsters will instantly spawn all over the arena.
You just have to kill monsters.
Monsters will continue to spawn over 15 minutes.
As the time progresses, the monsters which spawn will change and their difficulty will slightly increase.
To enter the Devil Square, you need a Devil Square Invitation and go to Noria to talk to the NPC Charon.
Only the first 10 players who show the Devil Square Invitation to the NPC Charon can enter.

Devil Square Invitation
Item used to enter the Devil Square

Charon
[Location]
Noria: (172, 106)
| Devil Square | Character Level | Magic Gladiator / Dark Lord / Rage Fighter levels |
|---|---|---|
| 1 | 15 ~ 130 | 10 ~ 110 |
| 2 | 131 ~ 180 | 111 ~ 160 |
| 3 | 181 ~ 230 | 161 ~ 210 |
| 4 | 231 ~ 280 | 211 ~ 260 |
| 5 | 281 ~ 330 | 261 ~ 310 |
| 6 | 331 ~ 400 | 311 ~ 400 |
| 7 | Master Level 0 ~ 200 | Master Level 0 ~ 200 |
To get the Devil Square Invitation you must go to the Chaos Goblin Machine and select the "Regular Combination" option and enter the following items.
Required Combination Material:
1 Devil's Key
1 Devil's Eye
1 Jewel of Chaos
Zen
* Only items of the same level can be combined to create the Devil Square Invitation for that specific Devil Square.
Probability: It depends on the level of the invitation.
Successful Result: Devil Square Invitation.
Failed Result: All items will be destroyed.

Chaos Goblin Machine
[Location]
Noria: 180, 102

Devil's Eye
You can get this item by hunting monsters or by buying it from NPC 'Lumen the Barmaid'

Devil's Key
You can get this item by hunting monsters or by buying it from NPC 'Lumen the Barmaid'
| Devil Square | Success Rate | Items | Zen |
|---|---|---|---|
| 1 | 75% | Devil's Key +1 & Devil's Eye +1 | 100.000 |
| 2 | 70% | Devil's Key +2 & Devil's Eye +2 | 200.000 |
| 3 | 65% | Devil's Key +3 & Devil's Eye +3 | 400.000 |
| 4 | 60% | Devil's Key +4 & Devil's Eye +4 | 700.000 |
| 5 | 55% | Devil's Key +5 & Devil's Eye +5 | 1.100.000 |
| 6 | 50% | Devil's Key +6 & Devil's Eye +6 | 1.600.000 |
| 7 | 45% | Devil's Key +7 & Devil's Eye +7 | 2.000.000 |
| Item | Monster Level Drop |
|---|---|
| Devil's Key +1 & Devil's Eye +1 | Level 3 |
| Devil's Key +2 & Devil's Eye +2 | Level 36 |
| Devil's Key +3 & Devil's Eye +3 | Level 47 |
| Devil's Key +4 & Devil's Eye +4 | Level 60 |
| Devil's Key +5 & Devil's Eye +5 | Level 70 |
| Devil's Key +6 & Devil's Eye +6 | Level 80 |
| Devil's Key +7 & Devil's Eye +7 | Level 90 |
The event reward is Experience.
The higher you are in the ranking, the more experience you will receive.
You need to get the most event points.
Event points are earned by killing monsters.
You must survive the event in order to be ranked and receive the reward.
Event Duration: 15 minutes
Minimum Players: 1
Maximum Players: 10
The Devil's Square Invitation will be removed from your inventory when you enter Devil Square.
Each character can play this event a limit of 6 times per day. (It may be different on unofficial servers)
If you die in Devil Square you will not lose experience, zen or drop items.
If the character has 'PK status', they will not be able to enter the Devil Square.
Party is allowed and can be formed inside the Devil Square.
The warp command can be used after entering the Devil Square.
The player who uses 'Town portal scroll' in Devil Square will return to Noria.
Players remaining in Devil Square after its completion will be returned to Noria.
PVP is not allowed.
In order to do a Sub Quest you must go to the NPC Shadow Phantom Soldier and according to your level complete the mission.
Sub quests can only be done 1 time.
Dark Knight, Fairy Elf, Dark Wizard.
Dark Lord, Magic Gladiator, Rage Fighter.
| Level | Quest Name | Quest Requirements | Reward | |
|---|---|---|---|---|
| 15-130 | 10-100 | Devil Square Challenge (1) | Press F1 to see the time of Devil Square 1 | - |
| Devil Square Challenge (2) | Kill 40 Cursed Lich located in Elbeland | Devil's Invitation +1 | ||
| Devil Square Challenge (3) | Achieve 50 points in Devil Square 1 | 100.000 Zen | ||
| Devil Square Challenge (4) | Kill the monsters and survive the Devil Square 1 | 100.000 Exp 200.000 Zen | ||
| 131-180 | 111-160 | Devil Square Adaptation (1) | Press F1 to see the time of Devil Square 2 | - |
| Devil Square Adaptation (2) | Kill 60 Death Cows located in Losttower | Devil's Invitation +2 | ||
| Devil Square Adaptation (3) | Achieve 100 points in Devil Square 2 | 200.000 Zen | ||
| Devil Square Adaptation (4) | Kill the monsters and survive the Devil Square 2 | 800.000 Exp 300.000 Zen | ||
| 181-230 | 161-210 | Fastest Way to Train (1) | Kill 80 Alquamos located in Icarus | Devil's Invitation +3 |
| Fastest Way to Train (1) | Achieve 130 points in Devil Square 3 | 800.000 Exp 500.000 Zen | ||
| Fastest Way to Train (1) | Kill the monsters and survive the Devil Square 3 | 1.000.000 Exp 1 Jewel of Chaos | ||
| 231-280 | 211-260 | Fastest Way to Train (2) | Kill 80 Iron Wheels located in Tarkan | Devil's Invitation +4 |
| Fastest Way to Train (2) | Achieve 160 points in Devil Square 4 | 1 Jewel of Chaos 500.000 Zen | ||
| Fastest Way to Train (2) | Kill the monsters and survive the Devil Square 4 | 1 Jewel of Soul | ||
| 281-330 | 261-310 | Fastest Way to Train (3) | Kill 100 Beam Knights located in Tarkan 2 | Devil's Invitation +5 |
| Fastest Way to Train (3) | Achieve 190 points in Devil Square 5 | 1 Jewel of Soul | ||
| Fastest Way to Train (3) | Kill the monsters and survive the Devil Square 5 | 1 Jewel of Bless | ||
| 331-400 | 311-400 | Fastest Way to Train (4) | Kill 120 Ice Walkers located in La Cleon | Devil's Invitation +6 |
| Fastest Way to Train (4) | Achieve 210 points in Devil Square 6 | 1 Jewel of Harmony | ||
| Fastest Way to Train (4) | Kill the monsters and survive the Devil Square 6 | 1 Jewel of Life | ||
| Master Level | Fastest Way to Train (5) | Kill 140 Shadow Knights located in Swamp of Peace | Devil's Invitation +7 | |
| Fastest Way to Train (5) | Achieve 240 points in Devil Square 7 | 2 Jewel of Soul | ||
| Fastest Way to Train (5) | Kill the monsters and survive the Devil Square 7 | 2 Jewel of Bless | ||

Level 28
Health: 850
Min/Max Attack: 100 ~ 105
Defense: 35
Defense Success Rate: 35

Level 34
Health: 1100
Min/Max Attack: 115 ~ 120
Defense: 45
Defense Success Rate: 41

Level 38
Health: 1400
Min/Max Attack: 125 ~ 130
Defense: 55
Defense Success Rate: 45

Level 40
Health: 1600
Min/Max Attack: 130 ~ 135
Defense: 60
Defense Success Rate: 47

Level 46
Health: 2500
Min/Max Attack: 145 ~ 150
Defense: 75
Defense Success Rate: 61

Level 47
Health: 2800
Min/Max Attack: 148 ~ 153
Defense: 78
Defense Success Rate: 67

Level 55
Health: 6000
Min/Max Attack: 165 ~ 175
Defense: 100
Defense Success Rate: 82

Level 48
Health: 3000
Min/Max Attack: 150 ~ 155
Defense: 80
Defense Success Rate: 70

Level 50
Health: 3500
Min/Max Attack: 155 ~ 160
Defense: 85
Defense Success Rate: 73

Level 54
Health: 4000
Min/Max Attack: 160 ~ 170
Defense: 95
Defense Success Rate: 79

Level 57
Health: 4500
Min/Max Attack: 170 ~ 180
Defense: 110
Defense Success Rate: 85

Level 62
Health: 5500
Min/Max Attack: 190 ~ 200
Defense: 120
Defense Success Rate: 91

Level 64
Health: 6000
Min/Max Attack: 200 ~ 210
Defense: 130
Defense Success Rate: 94

Level 74
Health: 20000
Min/Max Attack: 250 ~ 310
Defense: 200
Defense Success Rate: 125

Level 57
Health: 4500
Min/Max Attack: 170 ~ 180
Defense: 110
Defense Success Rate: 85

Level 60
Health: 5000
Min/Max Attack: 180 ~ 195
Defense: 115
Defense Success Rate: 88

Level 64
Health: 6000
Min/Max Attack: 200 ~ 210
Defense: 130
Defense Success Rate: 94

Level ?
Health: ?
Min/Max Attack: ? ~ ?
Defense: ?
Defense Success Rate: ?

Level 70
Health: 10000
Min/Max Attack: 220 ~ 250
Defense: 170
Defense Success Rate: 350

Level 74
Health: 14000
Min/Max Attack: 260 ~ 290
Defense: 190
Defense Success Rate: 400

Level 77
Health: 26000
Min/Max Attack: 300 ~ 360
Defense: 220
Defense Success Rate: 385

Level 70
Health: 10000
Min/Max Attack: 220 ~ 250
Defense: 170
Defense Success Rate: 350

Level 74
Health: 14000
Min/Max Attack: 260 ~ 290
Defense: 190
Defense Success Rate: 400

Level 75
Health: 11500
Min/Max Attack: 255 ~ 290
Defense: 195
Defense Success Rate: 125

Level 76
Health: 13500
Min/Max Attack: 260 ~ 300
Defense: 200
Defense Success Rate: 130

Level 80
Health: 17500
Min/Max Attack: 290 ~ 340
Defense: 220
Defense Success Rate: 150

Level 82
Health: 19000
Min/Max Attack: 305 ~ 350
Defense: 230
Defense Success Rate: 160

Level 86
Health: 38000
Min/Max Attack: 500 ~ 570
Defense: 350
Defense Success Rate: 525

Level 75
Health: 11500
Min/Max Attack: 255 ~ 290
Defense: 195
Defense Success Rate: 125

Level 76
Health: 13500
Min/Max Attack: 260 ~ 300
Defense: 200
Defense Success Rate: 130

Level 78
Health: 15000
Min/Max Attack: 270 ~ 320
Defense: 210
Defense Success Rate: 140

Level 74
Health: 12000
Min/Max Attack: 270 ~ 295
Defense: 185
Defense Success Rate: 397

Level 86
Health: 31000
Min/Max Attack: 435 ~ 490
Defense: 310
Defense Success Rate: 210

Level 93
Health: 40000
Min/Max Attack: 590 ~ 650
Defense: 420
Defense Success Rate: 220

Level 102
Health: 55000
Min/Max Attack: 560 ~ 600
Defense: 550
Defense Success Rate: 310

Level 78
Health: 15000
Min/Max Attack: 270 ~ 320
Defense: 210
Defense Success Rate: 140

Level 80
Health: 17500
Min/Max Attack: 290 ~ 340
Defense: 220
Defense Success Rate: 150

Level 83
Health: 20000
Min/Max Attack: 310 ~ 370
Defense: 235
Defense Success Rate: 160

Level 84
Health: 25000
Min/Max Attack: 375 ~ 425
Defense: 275
Defense Success Rate: 190

Level 92
Health: 34500
Min/Max Attack: 489 ~ 540
Defense: 360
Defense Success Rate: 240

Level 92
Health: 37000
Min/Max Attack: 500 ~ 560
Defense: 365
Defense Success Rate: 240

Level 100
Health: 50000
Min/Max Attack: 600 ~ 625
Defense: 500
Defense Success Rate: 780

Level 105
Health: 30000
Min/Max Attack: 475 ~ 510
Defense: 715
Defense Success Rate: 270

Level 106
Health: 33000
Min/Max Attack: 500 ~ 540
Defense: 750
Defense Success Rate: 280

Level 117
Health: 37000
Min/Max Attack: 560 ~ 600
Defense: 800
Defense Success Rate: 320

Level 119
Health: 40000
Min/Max Attack: 610 ~ 650
Defense: 835
Defense Success Rate: 330

Level 121
Health: 50000
Min/Max Attack: 640 ~ 680
Defense: 935
Defense Success Rate: 370

Level 123
Health: 55000
Min/Max Attack: 700 ~ 740
Defense: 1015
Defense Success Rate: 380

Level 135
Health: 75000
Min/Max Attack: 850 ~ 900
Defense: 1300
Defense Success Rate: 430