Devil Square is one of the most iconic events in MU Online, where players test their strength and endurance against endless hordes of monsters. Within this mystical arena, adventurers must fight increasingly powerful waves within a limited time, accumulating points and experience that will allow them to climb the event ranking.
Throughout the history of the continent, the Elf Tree was corrupted and transformed into the feared Immoral Tree, an inexhaustible source of dark creatures. To contain this power, the kingdoms trapped the tree in a dimensional space: the Devil Square. Today, this place serves as a training ground and ultimate challenge for the heroes of MU.
In this guide, you will learn everything you need to know about the Devil Square event: how to enter, level requirements, how to obtain the Devil Square Invitation, rewards, sub-quests, and strategies to survive the monster waves. Get ready to discover every detail and maximize your experience and zen gains in one of the game's most popular events.
The History of Devil Square
Devil Square |
In the early history of MU Online, in the city of Noria, there was the Elf Tree, a sacred monument created by the Queen of Elves, Aria. This tree had the power to naturally give life to elves, being a source of balance and prosperity for the entire continent.
However, the ambition of Secrarium led to the corruption of the tree. By deceiving Lugard, he discovered its location and contaminated it, transforming it into the feared Immoral Tree, capable of spawning hordes of monsters. Its power grew to the point of becoming an uncontrollable threat. To contain the catastrophe, the kingdoms of the continent joined forces and trapped the Immoral Tree in a closed dimension: the Devil Square. There, monsters continue to appear without rest, turning the place into an eternal battlefield. Today, what was once a curse has been transformed into a training ground for the bravest adventurers. With a Devil Square Invitation, warriors can access this arena and face waves of creatures that will test their endurance and skill. |
How to Play in Devil Square
The Devil Square event in MU Online is a survival challenge where the main mission is to
kill monsters and survive until the end. The difficulty increases progressively, and only the strongest players will complete the event.
Main Quest
- The primary objective is to eliminate waves of monsters within a 15-minute time limit.
- When the event starts, monsters appear immediately across the arena.
- As time progresses, the number and strength of enemies increase, making Devil Square an extreme training ground.
- You can participate individually or in a team, but points and experience depend on personal performance.
Tips for Players
- Keep moving to avoid being surrounded by monsters.
- If participating in a group, assign roles: a tank character, an area damage wizard, and a support elf usually make a difference.
- Use the full 15 minutes to accumulate as many points as possible, as this will determine the final rewards.
How to Enter Devil Square
NPC Charon Location: Noria (172, 106) |
To enter Devil Square, you will need a Devil Square Invitation. This item must be shown to NPC Charon, located in the city of Noria at coordinates (172, 106). Only the first 10 players to submit their invitation can enter the event. Once inside, you will face constant waves of monsters, testing your endurance and combat skills. Remember that PK status characters cannot participate and each player can enter up to 6 times per day. Coordinate with your party to maximize your chances of success. |
Devil Square Invitation
Item required to enter Devil Square.
Devil Square Levels
The Devil Square is divided into different stages or rooms, each with an allowed character level range. This ensures players face monsters and challenges balanced according to their progress in MU Online.
| Devil Square | Character Level | MG / DL / RF 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 |
How to Obtain the Devil Square Invitation
To enter the event, you will need to craft a Devil Square Invitation. This item is obtained by combining specific materials in the Chaos Machine located at Noria (180, 102). The combination may fail, destroying all used items, and the success rate depends on the invitation level.
Devil's Key
Obtained by defeating monsters or can be purchased from Lumen the Barmaid in Lorencia.
Devil's Eye
Like the key, it can drop from monsters or be bought at Lumen's tavern.
Jewel of Chaos
A must-have jewel in MU Online, used in most combinations in the Chaos Machine.
To create the Devil Square Invitation, combine the above items in the Chaos Machine. Note that the level of the Devil's Key and Devil's Eye must match to craft the corresponding invitation.
Combination Success Rates
| Devil Square | Success Rate | Materials | 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 |
Combination Results
- Success: You obtain the corresponding Devil Square Invitation.
- Failure: All used items are destroyed.
Item Drop for Devil Square Entry
The main materials to create the Devil Square Invitation (Devil's Key and Devil's Eye) can be obtained by hunting monsters according to their level. Below is the item corresponding to the monster level:
| Item | Item Level | Monster Level |
|---|---|---|
| Devil's Key +1 & Devil's Eye +1 | +1 | 3 |
| Devil's Key +2 & Devil's Eye +2 | +2 | 36 |
| Devil's Key +3 & Devil's Eye +3 | +3 | 47 |
| Devil's Key +4 & Devil's Eye +4 | +4 | 60 |
| Devil's Key +5 & Devil's Eye +5 | +5 | 70 |
| Devil's Key +6 & Devil's Eye +6 | +6 | 80 |
| Devil's Key +7 & Devil's Eye +7 | +7 | 90 |
Besides hunting, Devil's Key and Devil's Eye can also be purchased directly from Lumen the Barmaid.
Devil Square Rewards
Rewards in the Devil Square event are based on the points earned by defeating monsters. The more enemies you eliminate and the longer you survive, the more experience you gain.
- The main reward is Experience (EXP).
- Ranking is determined by accumulated points.
- You must survive until the end of the event to receive the reward.
- The top-ranked players receive the highest amount of experience.
Devil Square Subquests
In addition to experience and zen obtained in the event, players can complete special Subquests by talking to the NPC Shadow Phantom Soldier. These missions are unique and can only be done once per character, offering extra rewards such as invitations, jewels, and large amounts of experience.
| Level | Quest Name | Requirements | Reward |
|---|---|---|---|
| 15-130 / 10-100 (Devil Square 1) | Devil Square Challenge (1) | Check Devil Square 1 time (F1) | - |
| Devil Square Challenge (2) | Kill 40 Cursed Lich in Elbeland | Devil’s Invitation +1 | |
| Devil Square Challenge (3) | Get 50 points in Devil Square 1 | 100,000 Zen | |
| Devil Square Challenge (4) | Survive Devil Square 1 | 100,000 EXP + 200,000 Zen | |
| 131-180 / 111-160 (Devil Square 2) | Devil Square Adaptation (1) | Check Devil Square 2 time (F1) | - |
| Devil Square Adaptation (2) | Kill 60 Death Cows in Losttower | Devil’s Invitation +2 | |
| Devil Square Adaptation (3) | Get 100 points in Devil Square 2 | 200,000 Zen | |
| Devil Square Adaptation (4) | Survive Devil Square 2 | 800,000 EXP + 300,000 Zen | |
| 181-230 / 161-210 (Devil Square 3) | Fastest Way to Train (1) | Kill 80 Alquamos in Icarus | Devil’s Invitation +3 |
| Fastest Way to Train (2) | Get 130 points in Devil Square 3 | 800,000 EXP + 500,000 Zen | |
| Fastest Way to Train (3) | Survive Devil Square 3 | 1,000,000 EXP + 1 Jewel of Chaos | |
| 231-280 / 211-260 (Devil Square 4) | Fastest Way to Train (1) | Kill 80 Iron Wheels in Tarkan | Devil’s Invitation +4 |
| Fastest Way to Train (2) | Get 160 points in Devil Square 4 | 1 Jewel of Chaos + 500,000 Zen | |
| Fastest Way to Train (3) | Survive Devil Square 4 | 1 Jewel of Soul | |
| 281-330 / 261-310 (Devil Square 5) | Fastest Way to Train (1) | Kill 100 Beam Knights in Tarkan 2 | Devil’s Invitation +5 |
| Fastest Way to Train (2) | Get 190 points in Devil Square 5 | 1 Jewel of Soul | |
| Fastest Way to Train (3) | Survive Devil Square 5 | 1 Jewel of Bless | |
| 331-400 / 311-400 (Devil Square 6) | Fastest Way to Train (1) | Kill 120 Ice Walkers in La Cleon | Devil’s Invitation +6 |
| Fastest Way to Train (2) | Get 210 points in Devil Square 6 | 1 Jewel of Harmony | |
| Fastest Way to Train (3) | Survive Devil Square 6 | 1 Jewel of Life | |
| Master Level (Devil Square 7) | Fastest Way to Train (1) | Kill 140 Shadow Knights in Swamp of Peace | Devil’s Invitation +7 |
| Fastest Way to Train (2) | Get 240 points in Devil Square 7 | 2 Jewels of Soul | |
| Fastest Way to Train (3) | Survive Devil Square 7 | 2 Jewels of Bless |
Devil Square Monsters
Cyclops
Health: 850
Min/Max Attack: 100 - 105
Defense: 35
Defense Success Rate: 35
Level 28
Skeleton Archer
Health: 1100
Min/Max Attack: 115 - 120
Defense: 45
Defense Success Rate: 41
Level 34
Hell Hound
Health: 1400
Min/Max Attack: 125 - 130
Defense: 55
Defense Success Rate: 45
Level 38
Hell Spider
Health: 1600
Min/Max Attack: 130 - 135
Defense: 60
Defense Success Rate: 47
Level 40
Poison Bull
Health: 2500
Min/Max Attack: 145 - 150
Defense: 75
Defense Success Rate: 61
Level 46
Shadow
Health: 2800
Min/Max Attack: 148 - 153
Defense: 78
Defense Success Rate: 67
Level 47
Gorgon (Final Boss)
Health: 6000
Min/Max Attack: 165 - 175
Defense: 100
Defense Success Rate: 82
Level 55
Dark Knight
Health: 3000
Min/Max Attack: 150 - 155
Defense: 80
Defense Success Rate: 70
Level 48
Poison Shadow
Health: 3500
Min/Max Attack: 155 - 160
Defense: 85
Defense Success Rate: 73
Level 50
Cursed Wizard
Health: 4000
Min/Max Attack: 160 - 170
Defense: 95
Defense Success Rate: 79
Level 54
Death Cow
Health: 4500
Min/Max Attack: 170 - 180
Defense: 110
Defense Success Rate: 85
Level 57
Death Knight
Health: 5500
Min/Max Attack: 190 - 200
Defense: 120
Defense Success Rate: 91
Level 62
Death Gorgon
Health: 6000
Min/Max Attack: 200 - 210
Defense: 130
Defense Success Rate: 94
Level 64
Hydra (Final Boss)
Health: 20000
Min/Max Attack: 250 - 310
Defense: 200
Defense Success Rate: 125
Level 74
Death Cow
Health: 4500
Min/Max Attack: 170 - 180
Defense: 110
Defense Success Rate: 85
Level 57
Devil
Health: 5000
Min/Max Attack: 180 - 195
Defense: 115
Defense Success Rate: 88
Level 60
Death Gorgon
Health: 6000
Min/Max Attack: 200 - 210
Defense: 130
Defense Success Rate: 94
Level 64
Schriker
Health: ?
Min/Max Attack: ? - ?
Defense: ?
Defense Success Rate: ?
Level ?
Orc Archer
Health: 10000
Min/Max Attack: 220 - 250
Defense: 170
Defense Success Rate: 350
Level 70
Orc Warrior
Health: 14000
Min/Max Attack: 260 - 290
Defense: 190
Defense Success Rate: 400
Level 74
Metal Balrog (Final Boss)
Health: 26000
Min/Max Attack: 300 - 360
Defense: 220
Defense Success Rate: 385
Level 77
Orc Archer
Health: 10000
Min/Max Attack: 220 - 250
Defense: 170
Defense Success Rate: 350
Level 70
Orc Warrior
Health: 14000
Min/Max Attack: 260 - 290
Defense: 190
Defense Success Rate: 400
Level 74
Axe Warrior
Health: 11500
Min/Max Attack: 255 - 290
Defense: 195
Defense Success Rate: 125
Level 75
Bloody Wolf
Health: 13500
Min/Max Attack: 260 - 300
Defense: 200
Defense Success Rate: 130
Level 76
Iron Wheel
Health: 17500
Min/Max Attack: 290 - 340
Defense: 220
Defense Success Rate: 150
Level 80
Queen Rainer
Health: 19000
Min/Max Attack: 305 - 350
Defense: 230
Defense Success Rate: 160
Level 82
Cursed King (Final Boss)
Health: 38000
Min/Max Attack: 500 - 570
Defense: 350
Defense Success Rate: 525
Level 86
Axe Warrior
Health: 11500
Min/Max Attack: 255 - 290
Defense: 195
Defense Success Rate: 125
Level 75
Bloody Wolf
Health: 13500
Min/Max Attack: 260 - 300
Defense: 200
Defense Success Rate: 130
Level 76
Mega Crust
Health: 15000
Min/Max Attack: 270 - 320
Defense: 210
Defense Success Rate: 140
Level 78
Death Angel
Health: 12000
Min/Max Attack: 270 - 295
Defense: 185
Defense Success Rate: 397
Level 74
Drakan
Health: 31000
Min/Max Attack: 435 - 490
Defense: 310
Defense Success Rate: 210
Level 86
Beam Knight
Health: 40000
Min/Max Attack: 590 - 650
Defense: 420
Defense Success Rate: 220
Level 93
Fire Golem (Final Boss)
Health: 55000
Min/Max Attack: 560 - 600
Defense: 550
Defense Success Rate: 310
Level 102
Lizard Warrior
Health: 15000
Min/Max Attack: 270 - 320
Defense: 210
Defense Success Rate: 140
Level 78
Iron Wheel
Health: 17500
Min/Max Attack: 290 - 340
Defense: 220
Defense Success Rate: 150
Level 80
Queen Rainer
Health: 20000
Min/Max Attack: 310 - 370
Defense: 235
Defense Success Rate: 160
Level 83
Poison Golem
Health: 25000
Min/Max Attack: 375 - 425
Defense: 275
Defense Success Rate: 190
Level 84
Queen Bee
Health: 34500
Min/Max Attack: 489 - 540
Defense: 360
Defense Success Rate: 240
Level 92
Alpha Crust
Health: 37000
Min/Max Attack: 500 - 560
Defense: 365
Defense Success Rate: 240
Level 92
Illusion of Kundun (Final Boss)
Health: 50000
Min/Max Attack: 600 - 625
Defense: 500
Defense Success Rate: 780
Level 100
Gigantis
Health: 30000
Min/Max Attack: 475 - 510
Defense: 715
Defense Success Rate: 270
Level 105
Berserk
Health: 33000
Min/Max Attack: 500 - 540
Defense: 750
Defense Success Rate: 280
Level 106
Balram (Trainee Soldier)
Health: 37000
Min/Max Attack: 560 - 600
Defense: 800
Defense Success Rate: 320
Level 117
Soram (Trainee Soldier)
Health: 40000
Min/Max Attack: 610 - 650
Defense: 835
Defense Success Rate: 330
Level 119
Persona
Health: 50000
Min/Max Attack: 640 - 680
Defense: 935
Defense Success Rate: 370
Level 121
Dreadfear
Health: 55000
Min/Max Attack: 700 - 740
Defense: 1015
Defense Success Rate: 380
Level 123
Dark Elf (Final Boss)
Health: 75000
Min/Max Attack: 850 - 900
Defense: 1300
Defense Success Rate: 430
Level 135
Devil Square in MU Online remains one of the most popular and thrilling events in the game. Participating in this event allows you to earn Devil Square rewards, ranging from valuable experience to unique items that strengthen your character.
To succeed, prepare your gear, choose the appropriate difficulty level, and take advantage of group coordination. Each match in Devil Square is an opportunity to improve your skills and obtain exclusive loot that will make a difference in your progress within MU Online.
Don't miss the chance to face the challenges of Devil Square and become a stronger, more strategic player. Your next victory awaits!
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