Combat Mechanics
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The combat mechanics in Mu are pretty simple - but it can get a bit confusing as your level increases and new features become available. Check the information below to learn about the generalized mechanics of combat in the game!

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Introduction to combat... #
Essentially, the whole point of combat is to increase your character level so you can become the strongest warrior there is! Your character level will increase as you gain EXP. You'll gain EXP from hunting monsters, but you can also gain EXP by participating in quests or mini-games! EXP is split when fighting the same monster against another player, but it's shared when fighting monsters with Party members! Check below for details about how it all works!

Combat Controls
🖱 Left-click: normal attack
🖱 Right-click: skill attack
🖱 CTRL+Click: pvp attack
🖱 Middle-click: toggle MU Helper
⌨ SPACE: pick up nearby item
⌨ ALT: toggle item name display

Damage Types
🟠 Gold: normal damage
🔵 Blue: critical damage
🟢 Green: excellent damage
🔘 Cyan: true damage
🟣 Pink: reflected damage
🔴 Red: pvp damage
🟡 Yellow: mastery skill damage
⚪ Grey: Punish damage

Skill Hot Keys
👉 Hot-keys: [1] ~ [9], & [0]
👉 Assign skills via Skill Menu!
👉 Skill Menu hot key: [U]!
👉 Drag and drop, or [CRTL]+[#] to assign.

Consumable Hot Keys
👉 Hot-keys: [Q], [W], [E], [R]
👉 Drag and drop items to assign!
👉 You can assign any consumable item!
Gain EXP by killing monsters!
👉 Increase your level & stats
👉 Gain stat points to assign!
👉 Complete quests for extra EXP!
👉 Play mini-games for extra EXP!
Evolve your character class!
👉 Evolve at level 400 & 800!
👉 Build skill trees!
👉 Unlock mastery skills!
👉 Enhance old skills!
🛑 Characters stop gaining EXP! 🛑
Evolve or you'll stop gaining EXP!
Tier 2 classes stop gaining EXP at level 400.
Tier 3 classes stop gaining EXP at level 800.
Tier 3 classes must kill monsters level 95+.
Tier 4 classes must kill monsters level 160+.
⚠ EXP & Zen decreases on death! ⚠
Level 1 ~ 150: 1% EXP loss!
Level 151 ~ 220: 2% EXP loss!
Level 221+: 3% EXP loss!
4% Zen loss from both inventory and vault!
General EXP Split System
  • When multiple characters attack the same monster, each character receives EXP based on the percentage (%) of damage dealt to the monster's total HP.
  • Example:
    • Character A deals 60,000 damage and Character B deals 40,000 damage to a monster with 100,000 HP
    • Character A receives 60% of their character's calculated EXP
    • Character B receives 40% of their character's calculated EXP.
Party EXP Share System
  • Party members share EXP based on character level.
  • The character levels of each party member are converted to a ratio.
  • The EXP gained from the highest level party member is split between all party members according to the ratio of character levels.
  • Example:
    • Assume a level 400 character earns x2,000 EXP when killing Skeleton monster solo.
    • Assume the level 400 creates a Party with two level 300 characters.
    • Convert party member levels to a ratio = 300:300:400 = 3:3:4
    • Party members will gain EXP based on the level 400 character's EXP gain.
    • Additionally, each party member gains +3% EXP due to Party EXP Bonus.
    • Ratio calculation: 3:3:4 of 2,000 = 600:600:800.
    • Bonus EXP calculation: (600 + 3%) = 618; (800 + 3%) = 824.
    • Therefore the Level 400 character gains (x824) EXP and the Level 300 characters gain (x618) EXP.
Loot drops from killing monsters
  • Zen can be dropped from killing any monster.
  • The amount of Zen dropped is based on EXP gain.
  • Zen only drops if you are gaining EXP.
  • Any item drop can be bound with +Luck.
  • Any item drop from boss monster can be bound with +Life Option.
  • Monsters over level 20 drop excellent items and jewels.
  • Excellent items and jewels have an extremely low drop rate.
  • Boss Monsters have a high drop rates, but they are slow to respawn.
  • Some boss monsters may drop ancient items.
  • Raklion is the only map Socket Items are dropped.
  • The following items are dropped by all monsters:
Universal Drops
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Stats & skills... #
Character attributes, such as your character's defense, will passively increase as your character's level increases. However, as your level increases you will also gain stat points. You can freely add these points to any stat you would like. Adding stat points additionally increases character attributes. You'll want to be careful though, because removing stat points can be very expensive and difficult! As you add stat points, you'll be able to wear new equipment and learn new skills. Learning new skills will be essential to your combat! Once you've learned a skill, you'll want to work to balance your mana regeneration so that you don't need to use mana potions while hunting. You will want to stop using normal attack as soon as possible and only use skills for attacking!

Character Menu
👉 Character menu hot key: [C]!
👉 Detailed view: [SHIFT]+[C]!

Character Specialization
👉 All characters have a specialized stat!
👉 Adding lots of stat points to a specialized stat will give passive bonus effects!

Skill Menu
👉 Skill menu hot key: [U]!

Skill Imprint Bonus
👉 Pentagram unlocks skill imprint bonus!
👉 Skill imprint gives bonus skill damage!
👉 Each skill has a certain imprint % value!
👉 Base imprint damage is based on pentagram.
👉 Pentagram item level increases imprinting!
👉 Errtel item level increases imprinting!
👉 Errtel rank level increases imprinting!
👉 Imprint value * imprint % = imprint damage!

Skill Tooltip
👉 Skills use mana / AG to cast!
👉 Skills have a max cast range.
👉 Basic skill damage can be increased!
👉 Skills are upgradable after level 400!
Learning Skills
👉 Buy skill items from NPCs!
👉 Skill items drop from monsters!
👉 Some weapons are bound with +Skill!
👉 Some mounts are bound with +Skill!
👉 Learn new skills from skill trees!
Notes & Tips
  • Skills displayed in black-and-white are locked or some requirement is lacking.
  • To use skills with the MU Helper, it must be assigned to a hot-key.
  • Check our map database for Skill Item drop lists.
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Passives, bonuses, formulas, & calculations... #
If you want to get technical about combat, there is a lot going on! Use the details below to help understand how combat related things are formulated and calculated in the game.
Auto-regeneration ("auto-regen")
👉 Auto-regen happens every 3 seconds
👉 Mana and AG automatically regenerate!
👉 SD regenerates in safe-zones!
👉 Certain items give HP auto-regen!
Auto-regen base value
👉 Mana regen amount = (Mana / 27.5)
👉 AG regen amount = 2 + (AG / 20)
👉 SD regen amount = ?
👉 Certain items increase auto-regens!
Damage calculation
👉 Critical DMG = your maximum damage
👉 Excellent DMG = (Critical DMG * 1.1)
👉 Excellent weapons have a 5% base chance to deal excellent damage.
Over Rate Bonus
Absorb DMG +80%
97% Dodge chance
👉 Unlocked when your DEF Rate is greater than the monster's ATK Rate!
DEF Rate Bonus
+10% DEF Rate
👉 Unlock by equipping a full armor set!
DEF Bonus
+5% DEF
👉 Unlock by equipping a full +10 armor set!
DEF Bonus
+10% DEF
👉 Unlock by equipping a full +11 armor set!
DEF Bonus
+15% DEF
👉 Unlock by equipping a full +12 armor set!
DEF Bonus
+20% DEF
👉 Unlock by equipping a full +13 armor set!
DEF Bonus
+25% DEF
👉 Unlock by equipping a full +14 armor set!
DEF Bonus
+30% DEF
👉 Unlock by equipping a full +15 armor set!
Tier 4 Character Class DMG & DEF Adjustment
All Tier 4 Character Classes may have their DMG and DEF calculations slightly adjusted, based on the Monster Level of the target. This makes it more difficult for a lower level, Tier 4, character to attack a high level monster.
  • If a character's Character Level is less than 600 Character Levels greater than the target's Monster Level, The character's DMG & DEF is adjusted.
  • DMG & DEF adjustment:
    • DMG dealt to monster -10%, per Character Level difference.
    • DMG received from monster +10%, per Character Level difference.
    • Up to a 70% DMG & DEF adjustment is the max possible effect.
    • DMG Counters affected:
      • Normal DMG
      • Elemental DMG
      • Debuff DMG
Other Formulas & Calculations
  • SD formula:
    • Base SD: Character Level * (Character Level / 30)
    • +1.2 SD per Stat Point.
    • +0.5 SD per DEF point.
  • Character Level Experience Points formula:
    • Level 1 ~ Level 400
      • (Character Level * Character Level) * (Character Level + 9) * 10
  • Health Points calculation:
    • Base HP is calculated from Stat Points and added to each character's unique Base Health Points.
    • HP gained from Pet Items is calculated from Base HP
    • HP gained from Premium Items is calculated from Base HP
    • HP gained from Buff Skill is calculated from Base HP
    • HP gained from Seed Sphere is calculated from Base HP
    • HP gained from Excellent Option is calculated from Base HP, and cannot be enhanced.
    • HP gained from Ancient Set Options is calculated from Base HP, and cannot be enhanced.
    • HP gained from Ancient Additional Option cannot be enhanced.
    • HP gained from Master Level Stat Points cannot be enhanced.
    • HP gained from Master Skill Tree Options cannot be enhanced.
  • Mana Points calculation:
    • Base MP is calculated from Stat Points and added to each character's unique Base Mana Points.
    • MP gained from Excellent Option is calculated from Base MP
    • MP gained from Premium Items is calculated from Base MP
    • MP gained from Seed Sphere is calculated from Base MP
    • MP gained from Buff Skill is calculated from Base MP
    • MP gained from Ancient Set Options is calculated from Base MP, and cannot be enhanced.
    • MP gained from Ancient Additional Option cannot be enhanced.
    • MP gained from Master Level Stat Points cannot be enhanced.
    • MP gained from Master Skill Tree Options cannot be enhanced.
  • DEF calculation:
    • Base DEF is calculated from Stat Points and equipped item's DEF.
    • DEF gained from Character Bonus is calculated from Base DEF.
    • DEF gained from Mount Items is calculated from Base DEF, and cannot be enhanced.
    • DEF gained from Premium Items cannot be enhanced.
    • DEF gained from Seed Sphere cannot be enhanced.
    • DEF gained from Ancient Set Options is calculated from Base DEF, and cannot be enhanced.
    • DEF gained from Additional Option cannot be enhanced.
    • DEF gained from Master Skill Tree Options cannot be enhanced.
  • AG recovery amount calculation:
    • AG is calculated from base Passive Effects.
    • AG automatically recovered from Master Skill Tree Options is calculated from Max AG points.
  • Absorb calculation:
    • Absorb is only calculated when it is actively bound to the character.
    • When multiple Absorb options are bound to a character, their percentage offsets (of 100%) are multiplied together to enhance the Base Absorb option's offset (of 100%).
    • Calculation example:
      • Item A has +40% Absorb and Item B has +65% Absorb
      • Item A has an offset of 60%
      • Item B has an offset of 35%
      • 60% * 35% = 21% offset
      • 100% - 21% = 79% Absorb
Notes & Tips
  • Items with +Luck increase critical damage rate.
  • Rings, Necklaces can have +Accessory Option which gives HP auto-regen.
  • Wings and Capes can have +Wing Option which gives HP auto-regen.
  • HP auto-regen can be unlocked from skill trees.
  • Auto-regens can be increased from skill trees.
  • An example of a "full armor set" would be: Leather Helm + Armor + Pants + Boots + Gloves.
  • A "full +10 armor set" would require each item in the set to be at least +10.
  • A "full armor set" can consist of any normal/excellent/ancient item grades.
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EXP Formula & bonuses... #


Seal Bonuses (Ascension + Wealth + Healing + Talismans)
Seals and Talismans combine their EXP boost together to maximize EXP gained. If none are active, it is +0%.


Map Bonus
In certain maps, a Map Bonus is given to all players.


Channel EXP
All servers give at least 100% Channel EXP. However, Gold Channel Servers give characters an extra EXP bonus!


Exp Event
Occasionally, there is an EXP Boost Event, which will give all players a EXP Event bonus. The value of the bonus varies from each Event.


Premium EXP Bonus
Premium EXP Bonus gained from any premium, EXP boosting item. The rates are listed under each item on this guide.

Page updated October 18, 2024 || b2023.09.11.001
Owned by Izak Thompson
All Rights Reserved || Copyright © 2012 ~ 2024
*WEBZEN IP, game content, and materials are trademarks and copyrights of Webzen Inc., and its Licensors, and is used with permission. © Webzen Inc. All rights reserved. The MU logo and the Webzen logo are trademarks of Webzen Inc. Voluntary legal agreement established in 2021.