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What is a "Devil Square"?

Devil Square - The Ultimate Survival Challenge

Devil Square is a mysterious and dangerous castle filled with countless monsters and valuable item drops. Warriors brave enough to enter will face relentless waves of enemies while competing for survival and rewards.

To enter, players must bring a Devil's Square Invitation to NPC Charon in Noria. The event is divided into four or seven different stages, depending on the server settings. The level of the stage a player enters is determined by their character level.


⚔️ Event Mechanics

  • The event lasts for 20 minutes.
  • Monsters will continuously spawn and roam the battlefield.
  • The objective is to survive and defeat as many monsters as possible to gain experience and score points.
  • Only the first 10 players who bring an invitation to NPC Charon will be granted entry.
  • Party mode can be enabled inside Devil's Square.

📜 Devil's Square Rules

  • The corresponding Devil's Square Invitation will be deleted upon entry.
  • The warp command can be used inside Devil's Square.
  • No additional players can enter once all 10 slots are filled.
  • If a player dies inside Devil's Square, they will be warped back to Noria.
  • Using a Town Portal Scroll inside Devil's Square will return the player to Noria.
  • No experience loss when a player dies.
  • No Zen loss when a player dies.
  • Items will not drop upon death.
  • PK (Player Kill) is not possible inside Devil's Square.
  • At the end of the event, all remaining characters will be warped back to Noria.

🏆 Are You Ready for the Challenge?

Survive, slay, and dominate Devil Square! Only the strongest warriors will emerge victorious in this battle of endurance. Do you have what it takes?

The Event based on the original MU Online and fully correspond to the original settings of our MU season. During the Event period, a mission Event will be held to reward players with various items according to the levels obtained.

How to make Event ticket

Combine the Devil's Key and Devil's Eye and one Jewel of Chaos through "Chaos Goblin" to get a Ticket to Devil's Square.

Level of Devil SquareLevel Restrictions (-20 LVL for MG and DL)
115~80
281~130
3131~180
4181~230
5231~280
6281~330
7331~400 (Master)

Screens from Event

Mu /img/event/devil square/ds.jpg

Assembly prediction: create a ticket of Devil Square [Vip +10%]

Regular Combination
Tax rate: 1% (changed in real-time)

Combining Success rate: 80% +10% Crywolf defense rate
Required zen: 101,000(100,000)*
MU arrow
  • Devil's Eye
  • Devil's Key
  • Devil's Invitation ()
  • Opt can add Talisman of Luck
    Notice that when you fail to combine the items you can lose the items
    Item levels must be identical to combine. items are of the same Level

    Assembly prediction: create a ticket of Devil Square [Vip +10%]

    Recipe variant Nr.:2
    Regular Combination
    Tax rate: 1% (changed in real-time)

    Combining Success rate: 80% +10% Crywolf defense rate
    Required zen: 101,000(100,000)*
    MU arrow
  • Devil's Eye+1
  • Devil's Key+1
  • Devil's Invitation+1 ()
  • Opt can add Talisman of Luck
    Notice that when you fail to combine the items you can lose the items
    Item levels must be identical to combine. items are of the same Level

    Assembly prediction: create a ticket of Devil Square [Vip +10%]

    Recipe variant Nr.:3
    Regular Combination
    Tax rate: 1% (changed in real-time)

    Combining Success rate: 80% +10% Crywolf defense rate
    Required zen: 202,000(200,000)*
    MU arrow
  • Devil's Eye+2
  • Devil's Key+2
  • Devil's Invitation+2 ()
  • Opt can add Talisman of Luck
    Notice that when you fail to combine the items you can lose the items
    Item levels must be identical to combine. items are of the same Level

    Assembly prediction: create a ticket of Devil Square [Vip +10%]

    Recipe variant Nr.:4
    Regular Combination
    Tax rate: 1% (changed in real-time)

    Combining Success rate: 80% +10% Crywolf defense rate
    Required zen: 404,000(400,000)*
    MU arrow
  • Devil's Eye+3
  • Devil's Key+3
  • Devil's Invitation+3 ()
  • Opt can add Talisman of Luck
    Notice that when you fail to combine the items you can lose the items
    Item levels must be identical to combine. items are of the same Level

    Assembly prediction: create a ticket of Devil Square [Vip +10%]

    Recipe variant Nr.:5
    Regular Combination
    Tax rate: 1% (changed in real-time)

    Combining Success rate: 80% +10% Crywolf defense rate
    Required zen: 707,000(700,000)*
    MU arrow
  • Devil's Eye+4
  • Devil's Key+4
  • Devil's Invitation+4 ()
  • Opt can add Talisman of Luck
    Notice that when you fail to combine the items you can lose the items
    Item levels must be identical to combine. items are of the same Level

    Assembly prediction: create a ticket of Devil Square [Vip +10%]

    Recipe variant Nr.:6
    Regular Combination
    Tax rate: 1% (changed in real-time)

    Combining Success rate: 80% +10% Crywolf defense rate
    Required zen: 1,111,000(1,100,000)*
    MU arrow
  • Devil's Eye+5
  • Devil's Key+5
  • Devil's Invitation+5 ()
  • Opt can add Talisman of Luck
    Notice that when you fail to combine the items you can lose the items
    Item levels must be identical to combine. items are of the same Level

    Assembly prediction: create a ticket of Devil Square [Vip +10%]

    Recipe variant Nr.:7
    Regular Combination
    Tax rate: 1% (changed in real-time)

    Combining Success rate: 80% +10% Crywolf defense rate
    Required zen: 1,616,000(1,600,000)*
    MU arrow
  • Devil's Eye+6
  • Devil's Key+6
  • Devil's Invitation+6 ()
  • Opt can add Talisman of Luck
    Notice that when you fail to combine the items you can lose the items
    Item levels must be identical to combine. items are of the same Level

    Assembly prediction: create a ticket of Devil Square [Vip +10%]

    Recipe variant Nr.:8
    Regular Combination
    Tax rate: 1% (changed in real-time)

    Combining Success rate: 80% +10% Crywolf defense rate
    Required zen: 2,020,000(2,000,000)*
    MU arrow
  • Devil's Eye+7
  • Devil's Key+7
  • Devil's Invitation+7 ()
  • Opt can add Talisman of Luck
    Notice that when you fail to combine the items you can lose the items
    Item levels must be identical to combine. items are of the same Level

    When and how long will the "Devil Square" Event is take place?

    The "Devil Square" Event will start exactly 13:00, that's in 4 hours, 11 minutes, 45 seconds from now, and the duration of the Event will be 20 minutes.

    Where the "Devil Square" Event is taking place?

    The Event called "Devil Square" takes place on ALL on the following map(-s):

    IMAGE
    MAP NAME
    Mu
    Devil Square (1 ~ 4)Devil Square is a legendary battlefield and one of MU’s most famous training arenas. Once a place of dread, it now serves as a proving ground for warriors seeking power. The Immoral Tree, a cursed entity, spawns waves of relentless monsters at specific times throughout the day, challenging participants to endure and defeat the hordes. Unlike traditional battles, warriors face no penalty upon death, allowing them to fight fearlessly and push their limits. What was once seen as a burden of war has now become a valuable training ground, attracting the bravest adventurers looking to hone their skills in an unrelenting combat scenario.
    Mu
    Devil Square (5 ~ 7)Devil Square is a developed training arena which entraps the Immoral Tree. During specific intervals throughout the day, evil monsters are spawned from the Immoral Tree! Once considered a burden of war, this place is now a popular training ground for adventurers! There is no penalty upon death in this Mini-game

    What NPCs/monsters are involved in the Event?

    IMAGE
    EVENT NPC DESCRIPTION
    Ogre archer
    Ogre archerAn elite ogre that serves as one of the higher-level threats in certain areas of MU.
    이벤트보스 - Event Boss
    Elite Ogre
    Elite Ogre이벤트보스 - Event Boss
    Dark Elf
    Dark Elf이벤트맵 등급 추가로 인한 몬스터 추가(2007.10.16) - Addition of monsters due to event map rating. 마의광장7_확장 - Devil`s Square 7_Expansion
    IMAGE
    MONSTER NAME
    LEVEL
    HP
    Skeleton Archer
    Skeleton ArcherBase Mob
    34 100 115 120 45 41 - - -
    Cyclops
    CyclopsBase Mob
    28 100 100 105 35 35 - - -
    Hell Hound
    Hell HoundBase Mob
    38 100 125 130 55 45 - - -
    Thunder Lich
    Thunder LichA thunder lich that controls the forces of lightning, often striking with deadly precision.
    Base Mob
    44 100 140 145 70 55 - - -
    Dark Knight
    Dark KnightBase Mob
    48 100 150 155 80 70 - - -
    Chief Skeleton Warrior
    Chief Skeleton WarriorBase Mob
    42 100 135 140 65 49 - - -
    Shadow
    ShadowA shadow monster that thrives in dark places. It can disappear and reappear at will.
    Base Mob
    47 100 148 153 78 67 - - -
    Poison Shadow
    Poison ShadowBase Mob
    50 100 155 160 85 73 - - -
    Cursed Wizard
    Cursed WizardBase Mob
    54 100 160 170 95 80 - - -
    Death Cow
    Death CowA death cow that stalks the plains, spreading fear and death wherever it goes.
    Base Mob
    57 100 170 180 110 85 - - -
    Death Gorgon
    Death GorgonBase Mob
    64 100 200 210 130 94 - - -
    Death Knight
    Death KnightA death knight that wields a large sword and commands respect on the battlefield.
    Base Mob
    62 100 190 200 120 91 - - -
    Bahamut
    BahamutBase Mob
    43 100 130 140 65 52 - - -
    Vepar
    VeparThe powerful Vepar, a beast known for its ability to control water and summon storms.
    Base Mob
    45 100 135 145 70 58 - - -
    Devil
    DevilA deadly poisonous shadow, known for its venomous touch and stealth tactics.
    Base Mob
    60 100 180 195 115 88 - - -
    Great Bahamut
    Great BahamutBase Mob
    66 100 210 230 150 98 - - -
    Lizard King
    Lizard KingBase Mob
    70 100 240 270 180 115 - - -
    Silver Valkyrie
    Silver ValkyrieBase Mob
    68 100 230 260 170 110 - - -
    Lizard Warrior
    Lizard Warrior시련의땅 - Land of Trials
    78 100 270 320 210 140 - - -
    Ax Warrior
    Ax Warrior시련의땅 - Land of Trials
    75 100 255 290 195 125 - - -
    Beam Knight
    Beam KnightBase Mob
    84 100 375 425 275 190 - - -
    Queen Rainier
    Queen RainierA queen rainier, a powerful creature that commands respect and fear from all who encounter it.
    Base Mob
    82 100 305 350 230 160 - - -
    Bloody wolf
    Bloody wolfBase Mob
    76 100 260 300 200 130 - - -
    Mutant
    MutantBase Mob
    72 100 250 280 190 120 - - -
    Iron Wheel
    Iron WheelAn iron wheel, a mechanical monstrosity that crushes everything in its path with incredible force.
    Base Mob
    80 100 280 330 215 150 - - -
    Tantalos
    TantalosA Tantalos, a deadly serpent known for its speed and venomous attacks.
    Base Mob
    83 100 335 385 250 175 - - -
    Queen Bee
    Queen Bee시련의땅 - Land of Trials
    92 100 489 540 360 240 - - -
    Poison Golem
    Poison Golem시련의땅 - Land of Trials
    84 100 375 425 275 190 - - -
    Fire Golem
    Fire Golem시련의땅 - Land of Trials
    102 55.000 560 600 550 310 - - -
    Alquamos
    AlquamosA Molt, a dangerous creature capable of shifting between forms, each deadlier than the last.
    Base Mob
    75 100 255 290 195 125 - - -
    Mega Crust
    Mega CrustBase Mob
    78 100 270 320 210 140 - - -
    Drakan
    DrakanA drakan, an ancient dragon that commands fire and magic with deadly effect.
    Base Mob
    86 100 425 480 305 210 - - -
    Alpha Crust
    Alpha CrustBase Mob
    92 100 489 540 360 240 - - -
    Phantom Knight
    Phantom KnightA phantasmal knight, a ghostly warrior that wields a cursed blade capable of slicing through anything.
    Base Mob
    96 100 560 610 425 270 - - -
    Great Drakan
    Great DrakanBase Mob
    100 100 650 700 495 305 - - -
    Gigantis
    Gigantis이벤트맵 등급 추가로 인한 몬스터 추가(2007.10.16) - Addition of monsters due to event map rating. 마의광장7_확장 - Devil`s Square 7_Expansion
    105 100 475 510 360 270 - - -
    Berserker
    Berserker이벤트맵 등급 추가로 인한 몬스터 추가(2007.10.16) - Addition of monsters due to event map rating. 마의광장7_확장 - Devil`s Square 7_Expansion
    106 100 500 540 410 280 - - -
    Balram
    Balram이벤트맵 등급 추가로 인한 몬스터 추가(2007.10.16) - Addition of monsters due to event map rating. 마의광장7_확장 - Devil`s Square 7_Expansion
    117 100 560 600 460 320 - - -
    Soram
    Soram이벤트맵 등급 추가로 인한 몬스터 추가(2007.10.16) - Addition of monsters due to event map rating. 마의광장7_확장 - Devil`s Square 7_Expansion
    119 100 610 650 510 330 - - -
    Persona
    Persona이벤트맵 등급 추가로 인한 몬스터 추가(2007.10.16) - Addition of monsters due to event map rating. 마의광장7_확장 - Devil`s Square 7_Expansion
    121 100 640 680 560 370 - - -
    Dreadfear
    Dreadfear이벤트맵 등급 추가로 인한 몬스터 추가(2007.10.16) - Addition of monsters due to event map rating. 마의광장7_확장 - Devil`s Square 7_Expansion
    123 100 700 740 610 380 - - -
    IMAGE
    BOSS MONSTER NAME
    LEVEL
    HP
    Gorgon
    GorgonA dangerous creature that roams the land, known for its petrifying gaze and ability to turn its enemies to stone.
    보스 - BOSS
    55 15.000 165 175 100 82 - - -
    Balrog
    Balrog보스 - BOSS
    66 20.000 220 240 160 99 - - -
    Hydra
    HydraHydra, a multi-headed creature capable of regenerating its heads when cut off. Known for its brutal attacks and resilience.
    보스 - BOSS
    74 25.000 450 310 200 125 - - -
    Death Beam Knight
    Death Beam KnightA mutant that roams the wastelands, feared for its unpredictable and violent nature.
    보스 - BOSS
    93 40.000 590 650 420 220 - - -
    Phoenix of Darkness
    Phoenix of Darkness보스 - BOSS
    108 95.000 950 1000 600 350 - - -

    What reward will you get from Event monsters or what will be the reward for success?

    Image Weapon`s name General item Excellent item Class used
    Offense power Defense Offense power Defense
    Exc. Gorgon Staff
    29~32 0 47~50 0 Can be equipped by DW, SM, GM, MG, DM
    Gorgon Staff +9
    56~59 0 74~77 0 Can be equipped by DW, SM, GM, MG, DM
    Exc. Bill of Balrog
    76~102 0 111~137 0 Can be equipped by DK, BK, BM, FE, ME, HE, MG, DM
    Bill of Balrog +9
    103~129 0 138~164 0 Can be equipped by DK, BK, BM, FE, ME, HE, MG, DM
    Image Jewel name
    Mu
    Jewel of Bless
    Basic Jewels - Jewels are the most expensive items of MU. Mostly used as an ingredient item for combination or crafting recipe and Items upgrades
    Mu
    Jewel of Soul
    Basic Jewels - Jewels are the most expensive items of MU. Mostly used as an ingredient item for combination or crafting recipe and Items upgrades
    Mu
    Socket Ore Piece
    Custom Impure Jewels - These items are additional added to server drop. These items are collect on events only. Used only for creating Jewels
    Image Common Item name
    Mu
    Mastery Box(Minor)
    Custom Quests - These items are additional added to server to increase quest amount
    Image Ring name Use level Option Explanation
    Mu
    Sapphire Ring
    Auto HP Regeneration +3% #Max Mana +4%
    Time Limited Rings - These items can be purchased from the Cash Item Shop or earned from special promotional events! Some of these items are time-limited items. These types of items expire after a certain amount of time and then can no longer be used
    0 Ice Resistance: 0
    Poison Resistance: 0
    Lightning Resistance: 0
    Fire Resistance: 0
    Earth Resistance: 0
    Wind Resistance: 0
    Water Resistance: 0
    Mu
    Ruby Ring
    Auto HP Regeneration +3% #Max HP +4%
    Time Limited Rings - These items can be purchased from the Cash Item Shop or earned from special promotional events! Some of these items are time-limited items. These types of items expire after a certain amount of time and then can no longer be used
    0 Ice Resistance: 0
    Poison Resistance: 0
    Lightning Resistance: 0
    Fire Resistance: 0
    Earth Resistance: 0
    Wind Resistance: 0
    Water Resistance: 0
    Mu
    Topaz Ring
    Auto HP Regeneration +3% #Zen increase +30%
    Time Limited Rings - These items can be purchased from the Cash Item Shop or earned from special promotional events! Some of these items are time-limited items. These types of items expire after a certain amount of time and then can no longer be used
    0 Ice Resistance: 0
    Poison Resistance: 0
    Lightning Resistance: 0
    Fire Resistance: 0
    Earth Resistance: 0
    Wind Resistance: 0
    Water Resistance: 0
    Mu
    Amethyst Ring
    Auto HP Regeneration +3% #Damage decrease +4%
    Time Limited Rings - These items can be purchased from the Cash Item Shop or earned from special promotional events! Some of these items are time-limited items. These types of items expire after a certain amount of time and then can no longer be used
    0 Ice Resistance: 0
    Poison Resistance: 0
    Lightning Resistance: 0
    Fire Resistance: 0
    Earth Resistance: 0
    Wind Resistance: 0
    Water Resistance: 0
    Image Necklace name Use level Option Explanation
    Mu
    Ruby Necklace
    Auto HP Regeneration +3% #Excellent Damage +10%
    Necklaces - Necklaces are an offensive Accessory Item. You cannot visually see the item when it is equipped by a character. Items have a max Level of +4. PVP Necklace items have a max Level of +3
    0 Ice Resistance: 0
    Poison Resistance: 0
    Lightning Resistance: 0
    Fire Resistance: 0
    Earth Resistance: 0
    Wind Resistance: 0
    Water Resistance: 0
    Mu
    Emerald Necklace
    Auto HP Regeneration +3% #Attack speed +7
    Necklaces - Necklaces are an offensive Accessory Item. You cannot visually see the item when it is equipped by a character. Items have a max Level of +4. PVP Necklace items have a max Level of +3
    0 Ice Resistance: 0
    Poison Resistance: 0
    Lightning Resistance: 0
    Fire Resistance: 0
    Earth Resistance: 0
    Wind Resistance: 0
    Water Resistance: 0
    Mu
    Sapphire Necklace
    Auto HP Regeneration +3% #Restores Mana per monster killed by (Char. Lv./8)
    Necklaces - Necklaces are an offensive Accessory Item. You cannot visually see the item when it is equipped by a character. Items have a max Level of +4. PVP Necklace items have a max Level of +3
    0 Ice Resistance: 0
    Poison Resistance: 0
    Lightning Resistance: 0
    Fire Resistance: 0
    Earth Resistance: 0
    Wind Resistance: 0
    Water Resistance: 0
    Image Currency name Amount
    Mu
    Goblin Points
    Goblin Points can be earned while playing the game. Currency is needed for item crafting - improvement
    50 GP
    Mu
    Zen
    Zen can be very easily obtained, but it also holds some value. There is always a demand for Zen because its used for such a wide variety of things in the game! High level players spend a lot of Zen repairing their expensive equipment and attempting to craft expensive items! This, in turn, is good for the low level player! There are certain items in the game that can be collected and sold to an NPC as a method of earning Zen easily! If you collect enough Zen (at least 200.000.000), you could likely buy some jewels with it!
    10,000,000 Zen
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