Season 7 to Season 12: New Classes, Maps and Changes in MU
Complete guide to MU Online Seasons 7–12: new classes, maps, mechanics and items introduced after the Season 6 baseline.
What Changed After Season 6
Season 6 (S6) established the foundation of modern MU Online with six classes, the Level 3 Wings system (via Condor Feather), Level 380 items, and Ancient sets. Starting with Season 7, Webzen began an expansion cycle that deeply altered several core game mechanics.
This article documents the most significant additions and changes from Seasons 7 through 12, focusing on verifiable information: classes, maps, items, and systems. All content here is encyclopedic and educational in nature.
Season 7: Master Level and the Rage Fighter
Season 7 was the first major post-S6 expansion and brought structural changes that define MU's late-game to this day.
Master Level System
Master Level (ML) is a second character progression layer activated upon reaching the regular level cap. The character begins earning Master Experience from monster kills, which is invested into the Master Skill Tree — an exclusive tree per class.
Each ML tree has three main branches:
| Branch | General Focus |
|---|---|
| Branch I | Base attribute increases (HP, mana, defense) |
| Branch II | Improvements to existing skills (damage, range, cooldown) |
| Branch III | Passive skills and advanced class bonuses |
The maximum allocatable points reach 400 at ML400, which is the cap in official servers on several versions. ML progression is independent of regular level progression — a character can be Level 400 ML0 or Level 400 ML400.
Rage Fighter (Fist Fighter)
The Rage Fighter is MU Online's seventh class, introduced in S7 Episode 3. Key characteristics:
- Weapons: Gauntlets and combat boots. Does not use swords, staves, or bows.
- Primary attributes: Strength and Vitality as focus, Agility secondary.
- Unique mechanic: Physical combos that chain skills. Dark Side deals area damage; Phoenix Shot is a long-range attack.
- Evolution chain:
Rage Fighter → Fist Master (1st Quest) → (no 3rd evolution in original S7)Seasons 8 and 9: New Maps and Content Expansion
Seasons 8 and 9 focused on world expansion and balance adjustments without introducing new classes.
Added Maps
Nars (Barren Lands) was introduced as a high-level farming zone, with monsters ranging from level 110 to 130. Drops include high-level Excellent items and materials for advanced Chaos Goblin combinations.
Loren Deep Dungeon expanded the Lorencia zone with underground floors. Each floor features higher monster density and increased Jewel drop chances, especially Jewel of Bless and Jewel of Soul.
| Map | Recommended Level | Notable Monsters |
|---|---|---|
| Nars | 300–350 | Death Rider, Dark Elf |
| Loren Deep | 280–320 | Crypta, Crypos |
| Swamp of Calmness | 320–360 | Swamp Monster, Lizard Warrior |
Muun System (Companions)
The Muun system was introduced in Seasons 8/9 as an expansion of the pet system. Muuns are creatures that accompany the character and grant passive bonuses. Unlike traditional pets (Guardian Angel, Imp, Unicorn), Muuns do not permanently die upon entering combat — they remain active even during PvP battles.
Seasons 10 and 11: Acheron and the Ruud System
Acheron Map
Acheron was added as one of the most demanding endgame maps in Seasons 10/11. Its structure is divided into zones with specific elemental resistances — monsters in certain areas take reduced damage from specific attack types, forcing build adaptation.
Acheron characteristics:
- Recommended level: 400+ (Master Level 100+)
- Monsters with HP exceeding 5,000,000
- Drops Season 10+ items (expanded Blood Angel and Holy Angel sets)
- Periodic Boss invasion: Lord of Ferea appears in an Acheron variant on some servers
Ruud System
Ruud is a secondary currency introduced in Seasons 10/11. It is obtained through:
- Completing Master Level quests
- Monster drops in high-level maps (Acheron, expanded Nars)
- Participation in periodic events (Doppelganger, Imperial Guardian)
Ruud is exchanged with the Ruud Exchanger NPC for exclusive items, including set parts specific to Seasons 10+ that do not exist in S6. The Ruud cost per item ranges from 400 to 4,000 depending on the piece.
| Item | Ruud Cost |
|---|---|
| Tier 1 Set Parts | 400–800 |
| Tier 2 Set Parts | 1,200–2,000 |
| Tier 3 Set Parts | 3,000–4,000 |
| ML Rings and Pendants | 2,500–3,500 |
Season 12: Fourth Evolution and the Pentagram
Season 12 brought two additions that fundamentally altered character progression and the item system.
Fourth Class Evolution
Seven of the eight classes (excluding the Rage Fighter in the initial S12 version) received a fourth evolution form. The complete evolution chain through S12 became:
Dark Knight → Blade Knight → Blade Master → Dragon Knight
Dark Wizard → Soul Master → Grand Master → Shining Wizard
Fairy Elf → Muse Elf → High Elf → Noble Elf
Magic Gladiator → (no 1st quest) → Duel Master → Magic Knight
Dark Lord → (no 1st quest) → Lord Emperor → Empire Lord
Summoner → Bloody Summoner → Dimension Master → Dimension Summoner
Rage Fighter → Fist Master → (3rd) → (4th S12+)Pentagram System
The Pentagram is a special item occupying a unique inventory slot that accepts Errtels — elemental gems providing bonuses. The Pentagram was introduced in S12 and does not exist in S6.
Each Pentagram has a base element (Fire, Water, Earth, Wind, Darkness) and can hold up to 4 Errtels of the corresponding element. The bonuses provide:
- Specific elemental resistance
- Additional damage against monsters of the opposing element
- Damage reduction against same-element monsters
- Attribute bonuses (STR, AGI, VIT, ENE) in fixed values per Errtel
Comparison: S6 vs Later Seasons
| Feature | Season 6 | Season 7–12 |
|---|---|---|
| Number of classes | 6 | 7 (with Rage Fighter in S7) |
| Master Level | Does not exist | Up to ML400 |
| Flame of Condor | Does not exist | L3 Wings ingredient |
| Pentagram | Does not exist | Introduced in S12 |
| Secondary currency (Ruud) | Does not exist | Introduced S10/11 |
| Fourth evolution | Does not exist | Introduced in S12 |
| Ancient Sets | Hyon, Gywen, Sebone, Kantata, Eplate, Agnis, Ceto, Drake, Gaia, Broy, Sylion, Heras, Chrono, Anubis, Enis, Aruan | Expanded with new sets per Season |
Jewels in S6 and Their Continuity in Later Versions
In Season 6, seven Jewels are available:
- Jewel of Bless — Increases item level without risk of downgrade
- Jewel of Soul — Increases item level (risk of level downgrade)
- Jewel of Life — Adds an additional option to items
- Jewel of Chaos — Base ingredient in all Chaos Goblin combinations
- Jewel of Creation — Ingredient for pet and Dinorant creation
- Jewel of Guardian — Ingredient for Fenrir creation and maintenance
- Jewel of Harmony — Adds Harmony options to normal and excellent items
In later Seasons, additional Jewels were added (Jewel of Gemstone, Jewel of Element, etc.), but the seven above remain as the base in every version of the game.
Conclusion
Seasons 7 through 12 represent a period of significant expansion for MU Online, with additions that altered everything from character progression (Master Level, fourth evolution) to itemization systems (Pentagram, Ruud) and world content (new maps and bosses). Understanding these differences is essential for players who move between different versions of the game or private servers based on specific Seasons.
For information on the base Season 6 experience, refer to the dedicated articles on classes, Ancient sets, and progression mechanics on ViciadosMU.
Perguntas frequentes
In which Season was the Rage Fighter introduced?
The Rage Fighter (also called Fist Fighter) was introduced in Season 7 Episode 3 on the official Korean server. It is a melee class specializing in unarmed combat, with skills like Dark Side (AoE) and Phoenix Shot (ranged). It does not use conventional weapons — only Gauntlets and combat boots.
What is the Master Level system?
Introduced in Season 7, Master Level (ML) allows characters that have reached the regular level cap to continue advancing through an exclusive skill tree called the Master Skill Tree. Each class has its own tree with hundreds of distributable points, improving damage, defense, cooldown reduction, and granting unique passive abilities.
Does the Flame of Condor exist in Season 6?
No. The Flame of Condor, used to craft Level 3 Wings via Chaos Goblin combination, was introduced starting in Season 7. In Season 6, Level 3 Wings are obtained through a different method that does not require the Flame of Condor as an ingredient.
What maps were added in Seasons 7 to 12?
Key additions include: Swamp of Calmness and Vulcanus (S7), Nars and Loren Deep Dungeon (S8/9), Acheron and expanded Karutan zones (S10+). Each map brought higher-HP monsters and new item drops, including parts of that Season's corresponding sets.
Does the Grow Lancer class exist in Season 6?
No. The Grow Lancer was added in Season 14 on the official server. In S6 the six available classes are: Dark Knight, Dark Wizard, Fairy Elf, Magic Gladiator, Dark Lord, and Summoner.