Muuns are MU Online's pet system: companions that follow you, level with you, and provide passive bonuses that stack on top of your gear. There are 205 unique Muuns on current files, from event giveaways to class-exclusive companions that are signs of serious progression. This page lists them all — grades, bonuses, evolution chains — read straight from our server's own Muun files. If a fan site disagrees with a bonus here, ours is the one the server actually uses.
| The Muun system at a glance | |
|---|---|
| Total unique Muuns | 205 (plus evolved variants; 386 entries total) |
| Grades | Normal (Grade 0), Rare (Grade 1), Epic (Grade 2) |
| Types | Standard (184), Mounts (4), Class/Special (17) |
| How to get them | Muun eggs from events, season rewards, boss drops, exchange NPCs |
| Duration | Most Muuns expire after 30 days; some are permanent |
| Evolution | Many Muuns evolve once with an Evolution Stone, gaining stronger bonuses |
| Tempest system | Season 18+ Muuns with Amplified and Wide variants; the strongest pet line |
How the Muun system works
Muuns hatch from Muun Eggs obtained through events, season rewards, and specific content. Once hatched, a Muun follows you and provides its listed passive bonus. Key mechanics:
- Grades: Normal (Grade 0) is the baseline; Rare (Grade 1) provides roughly double the bonus values; Epic (Grade 2) is event-only and tops the scale
- Duration: Most Muuns expire after 30 days, then return to egg form. Re-hatching preserves their level
- Evolution: Many Muuns have an evolved form unlocked with an Evolution Stone. Evolved Muuns gain stronger bonuses and some apply their effect in PvP as well
- Conditions: Many bonuses are conditional — active only on certain days, at certain hours, or within certain level ranges. Read the condition carefully before choosing your companion
- Muun food: Feeding a Muun levels it up; higher Muun levels scale the bonus values within the listed range
The class Muuns — the 17 special companions
These Type 5 Muuns are tied to classes and lore characters. They are the rarest and most prestigious companions — obtaining one signals you have access to high-end content. Each provides either a Skill Attack Power or Elemental Defense bonus:
| Muun | Bonus | Tied to |
|---|---|---|
| Prince | Skill Attack Power +15% (Non-PvP) | Lore character |
| Rex Millon | Elemental Defense +10% (Non-PvP) | Lore character |
| The Great Fairy Kara | Skill Attack Power +15% (Non-PvP) | Fairy lore |
| Great Wizard Eithamu | Elemental Defense +10% (Non-PvP) | Etramu lore |
| Fairy Queen Runedil | Skill Attack Power +15% (Non-PvP) | Elf lore — Queen Lunedill Diochell |
| Magician Gaion Karein | Elemental Defense +10% (Non-PvP) | Lore character |
| Tablet's Elpis | Skill Attack Power +15% (Non-PvP) | Lore character |
| Magic Swordsman Muren Rexmillon | Elemental Defense +10% (Non-PvP) | Muren lore |
| Lemuria & Kundun | Skill Attack Power +15% (Non-PvP) | Season 17 special |
| Elemental Elf | Elemental Defense +10% (Non-PvP) | Season 17 |
| Illusion Knight Jacquard | Skill Attack Power +15% (Non-PvP) | Season 18 — Zakard |
| Rage Fighter | Elemental Defense +10% (Non-PvP) | Season 6 class |
| Grow Lancer | Skill Attack Power +15% (Non-PvP) | Season 10 class |
| Dark Lord | Elemental Defense +10% (Non-PvP) | Season 2 class |
| Alchemist | Skill Attack Power +15% (Non-PvP) | Season 20 class |
| Rune Wizard | Elemental Defense +10% (Non-PvP) | Season 14 class |
| Crusader | Elemental Defense +10% (Non-PvP) | Season 21 class |
There is also Desmodus, the Slayer's exclusive Muun — a bat-like companion that only the Slayer can use, grown through her class changes. It is Type 1 but unique to her, worth mentioning alongside the class companions.
The epic Muuns (Grade 2)
Only three Muuns on current files carry the Epic grade — the rarest tier:
| Muun | Significance |
|---|---|
| Lion Mask | Event-exclusive, one of the highest combat bonuses available |
| Bael | Named after the demon — a top-tier combat companion |
| Snow Fairy | Winter event exclusive; the strongest defensive epic |
The top combat Muuns
The Grade 1 (Rare) Muuns that matter most in combat, sorted by bonus strength. Values shown are the base (Value0); higher Muun levels push toward the maximum within the range:
| Muun | Bonus | Condition |
|---|---|---|
| Savath | Excellent Damage +38% | Thu–Sun |
| Wooparoo | Attack/Magic/Curse Power +24% | Thu–Sun |
| William | Attack/Magic/Curse Power +24% | Thu–Sun |
| Witch | Max Attack/Magic/Curse Power +24% | Thu–Sun |
| Dark Phoenix | Max Attack Power +24% (Non-PvP; PvP when evolved) | — |
| Nightmare | Attack Power +24% (Non-PvP; PvP when evolved) | — |
| Hydra | Max Attack Power +24% (Non-PvP; PvP when evolved) | — |
| Gigantes | Attack Power +24% (Non-PvP; PvP when evolved) | — |
| Mantis | Max Attack Power +24% | — |
| The Fairy Guardian | Attack Power +24% (PvP) | — |
| Balrog | High combat bonus | Boss-themed |
| Medusa | High combat bonus | Boss-themed |
| Kundun | High combat bonus | Boss-themed |
The boss-themed Muuns (Balrog, Medusa, Kundun, Hellmine, Hydra, Nightmare, Dark Phoenix) are drops from or tied to their namesake bosses — they are both companions and trophies.
The Tempest Muun system (Season 18+)
Season 18 introduced the Tempest Muun — an upgradeable pet line with two paths:
- Tempest Muun (Amplified): focuses on raw attack power
- Tempest Muun (Wide): focuses on area-effect bonuses
Tempest Muuns are obtained from Tempest Muun Eggs and upgraded with Tempest Muun Evolution Stones, both from Season 18+ content. They have their own bonus table separate from standard Muuns and represent the current pet endgame.
Season reward Muuns
Each season hands out exclusive Muuns through its reward track and events. These are typically Grade 1 with strong conditional bonuses, and they cannot be obtained once the season ends — making them true status symbols. Season 19's reward Muuns (above) and Season 18's Tempest system are the current high-water marks.
Mounts and Guardians
Muuns also include the mount system. Key mounts:
| Mount | How to get | Notes |
|---|---|---|
| Uniria | Purchased from the horse trader in Lorencia | The starter mount; consumed on use |
| Dinorant | Craft: 10 Uniria + Chaos + Bless + Soul at the Chaos Machine | The flying mount; inherits Uniria options |
| Dark Horse | Dark Lord class system | The Dark Lord's personal mount and stat stick |
| Ghost Horse | Season 14 Guardian capsule | The Rune Wizard era mount |
| Giant Mounts | Season 17+ content | Large-scale mounts tied to the special classes |
| Fierce Lion | Season 15 seal system | The Slayer era mount |
The complete Muun list
All 205 unique Muuns from our server files, grouped by grade. Bonus column shows the primary effect; conditions vary (time of day, day of week, level range, PvP status). Full conditions are visible in-game on each Muun's tooltip.
Epic (Grade 2)
| Muun | Rank |
|---|---|
| Lion Mask | 4 |
| Bael | 4 |
| Snow Fairy | 4 |
Rare (Grade 1) — the top 50
| Muun | Primary bonus |
|---|---|
| Savath | Excellent Damage +38% |
| Wooparoo | Attack Power +24% |
| William | Attack Power +24% |
| Witch | Max Attack Power +24% |
| Dark Phoenix | Max Attack Power +24% (evolves to PvP) |
| Nightmare | Attack Power +24% (evolves to PvP) |
| Hydra | Max Attack Power +24% (evolves to PvP) |
| Hellmine | Attack Power +24% (evolves to PvP) |
| Gigantes | Attack Power +24% (evolves to PvP) |
| Rose Spirit | Max Attack Power +24% |
| Loggle | Attack Power +24% (evolves to PvP) |
| Trive | Max Attack Power +24% (evolves to PvP) |
| Mantis | Max Attack Power +24% |
| Surfing Girl | Max Attack Power +24% |
| Little Cupid | Attack Power +24% (evolves to PvP) |
| Toy Soldier | Max Attack Power +24% |
| Hammer | Max Attack Power +24% |
| Tarius | Attack Power +24% (evolves to PvP) |
| The Fairy Guardian | Attack Power +24% (PvP) |
| Snowboarder | Attack Power +24% (evolves to PvP) |
| Balrog | Boss-themed combat bonus |
| Medusa | Boss-themed combat bonus |
| Kundun | Boss-themed combat bonus |
| Bell | Combat bonus |
| Lapa | Combat bonus |
| Knicks | Combat bonus |
| Serufan | Combat bonus |
| Lord Silvester | Combat bonus |
| Legendary Warlock | Combat bonus |
| Fighter | Combat bonus |
| Shadow Phantom | Combat bonus |
| Warehouse Guardian | Combat bonus |
| Fairy Lara | Combat bonus |
| Uma King | Combat bonus |
| Panda Tao | Combat bonus |
| Polar Bear | Combat bonus |
| Fur Seal | Combat bonus |
| Lucky Rabbit | Combat bonus |
| Super Panda | Combat bonus |
| Belly Dancer | Combat bonus |
| Strong Captain | Combat bonus |
| Hip-Hop Dino | Combat bonus |
| Commander | Combat bonus |
| Scarecrow | Combat bonus |
| Skier | Combat bonus |
| Pilot | Combat bonus |
| Chrysanthemum | Combat bonus |
| Kris | Combat bonus |
| Samba Girl | Combat bonus |
| Busker Monkey | Combat bonus |
Normal (Grade 0) — notable picks
The 109 normal-grade Muuns include seasonal companions (Pumpkin Girl, Ghost, Mummy Boy for Halloween; Christmas Tree, Snowman for winter; Beach Girl, Surfing Girl for summer) and utility companions. While their bonuses are roughly half the Rare tier, they are far easier to obtain and still contribute meaningfully. The full list is visible in-game through the Muun inventory.
Play with Muuns on our server
All Muun systems are live on our Season 22 server — events running all day, season rewards active, and Tempest Muuns obtainable.
- Create your account — it takes about a minute
- Download the client and start collecting
- Choosing a class? The all-classes comparison shows which class Muuns pair with which class
MU Online Muun FAQ
What are Muuns in MU Online?
Muuns are pet companions that follow your character and provide passive bonuses — attack power, defense, critical damage, excellent damage, and more. There are 205 unique Muuns on current files, from event giveaways to class-exclusive companions.
How do you get Muuns?
Muun Eggs from events, season reward tracks, boss drops, and exchange NPCs. Hatch the egg to summon the Muun. Most expire after 30 days but return to egg form for re-hatching.
What is the best Muun in MU Online?
Savath (Excellent Damage +38% on Thu-Sun) for raw output; the class Muuns (Prince, Fairy Queen Runedil, etc.) for their 15% Skill Attack Power; and the Tempest Muun line for the current endgame. See the top combat table above.
What are the three epic Muuns?
Lion Mask, Bael, and Snow Fairy — Grade 2, event-exclusive, the rarest companions in the game.
Can Muuns evolve?
Yes. Many Muuns have an evolved form unlocked with an Evolution Stone. Evolved Muuns gain stronger bonuses and some apply their effects in PvP as well as PvE.
What is a Tempest Muun?
The Season 18+ pet upgrade system with Amplified (attack-focused) and Wide (area-effect) paths. Tempest Muuns are obtained from Tempest Muun Eggs and upgraded with Evolution Stones.
Do Muun bonuses stack with gear?
Yes — Muun bonuses are percentage-based passives that stack on top of your equipment, master tree, and other systems. They are one of the few multiplicative bonuses in the game.