Fenrir in MU Online: complete guide to the end-game wolf mount

The Fenrir is the ultimate pet goal in MU Online Season 6 — a wolf mount that surpasses the Dinorant in every way. The Black Fenrir specifically is one of the rarest and most coveted items in the game, representing the peak of what the pet system offers.

The three Fenrir types

Fenrir tier comparison:

Blue Fenrir (base):
→ The first Fenrir tier, obtained from the base Horn of Fenrir combination
→ Benefits: mount (riding), knockback immunity, defense bonus, movement speed
→ The Fenrir itself does NOT attack enemies (passive pet in blue form)
→ Status: common Fenrir, but still valuable

Red Fenrir (Gold Fenrir, offense tier):
→ Upgraded from Blue Fenrir with specific additional materials
→ Benefits: ALL Blue Fenrir benefits PLUS the Fenrir attacks nearby enemies
→ The attack: Fenrir bites enemies for significant damage
→ This turns the Fenrir from a passive mount into an active combat companion
→ Status: significantly rarer than Blue Fenrir

Black Fenrir (ultimate tier):
→ Upgraded from Red Fenrir with rare materials
→ Benefits: ALL Red Fenrir benefits PLUS additional stat increases
→ The black visual: the Fenrir model is black/dark instead of the default color
→ Additional bonuses: significantly higher defense and attack than Red/Blue
→ Status: extreme rarity — Black Fenrir owners are server-known figures
→ Equivalent of "full +15 gear" in terms of status — most players never own one

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Why have three tiers:

The tier system exists to give Fenrir long-term value:
→ Blue: achievable with consistent Tarkan farming
→ Red: requires extra investment (materials + successful upgrade)
→ Black: requires top-tier materials and successful multiple combinations
→ Each tier represents a meaningful milestone, not just a small incremental upgrade

The Fenrir crafting chain

Step-by-step crafting:

STAGE 1: Farm Pieces of Horn

Location: Tarkan (primary), Aida (secondary)
Drop source: specific high-level monsters in these areas
→ Iron Knight (Tarkan): drops Pieces of Horn
→ Tantalos (Tarkan): drops Pieces of Horn
→ Bloody Orc (some servers): also drops Pieces of Horn
→ Drop rate: moderate — expect 2-5 pieces per hour of focused farming

What are Pieces of Horn?
→ Raw crafting material, not usable as-is
→ Required in quantity for combination steps
→ Visually: a small item named "Piece of Horn" in inventory

How many to farm:
→ Required per combination step: varies (typically 5-10 pieces)
→ Recommended to farm before any attempt: 40-60+ pieces
→ Why so many: multiple combination steps, each with failure risk
→ Losing 30 pieces to a failed combination and having no backup: very demoralizing

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STAGE 2: Combine Pieces of Horn → Claw of Fenrir (first combination)

At Chaos Goblin:
Materials: Pieces of Horn (typically 5 per attempt) + Jewel of Chaos + Zen
Result (success): Claw of Fenrir
Result (failure): All materials lost
Success rate: ~60-70% (server-dependent)

Claw of Fenrir:
→ Intermediate crafting material (not equippable)
→ Required in the next combination step

How many Claws to produce:
→ Next step requires multiple Claws
→ Aim for 5-6 Claws before proceeding (protects against failure in Step 3)

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STAGE 3: Combine Claws of Fenrir → Horn of Fenrir (second combination)

At Chaos Goblin:
Materials: Multiple Claws of Fenrir + additional Jewels + Zen
Result (success): Horn of Fenrir
Result (failure): All materials lost
Success rate: ~50-70% (server-dependent)

Horn of Fenrir:
→ Intermediate crafting material (not equippable)
→ One more combination needed for the final Fenrir

How many Horns to have:
→ Most servers: 1 Horn needed for the final step
→ BUT: produce 2-3 Horns for safety (failure at this stage is very costly)

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STAGE 4: Combine Horn of Fenrir → Blue Fenrir (final step)

At Chaos Goblin:
Materials: Horn of Fenrir + Jewels (typically JoB, JoS, JoL) + Zen
Result (success): Blue Fenrir (equippable pet!)
Result (failure): All materials lost (including the Horn)
Success rate: ~70-80% (server-dependent)

After success:
→ Equip the Blue Fenrir in the pet slot
→ Your character is now mounted on a Fenrir wolf
→ All Blue Fenrir bonuses active

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STAGE 5: Upgrade Blue → Red Fenrir (offense upgrade)

Additional materials required:
→ Jewels of specific types (server-dependent, often JoL or rare items)
→ Some servers: require a specific item that drops from Tarkan bosses
→ Zen fee (higher than previous steps)

Result (success): Red Fenrir (the Fenrir now attacks enemies)
Result (failure): Blue Fenrir reverts to previous state OR materials lost (server-dependent)

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STAGE 6: Upgrade Red → Black Fenrir (ultimate upgrade)

Materials: very rare and expensive (server-dependent)
→ Often requires materials only available from high-end bosses
→ Zen fee: very high
→ Success rate: lower than previous steps

Result (success): Black Fenrir (maximum Fenrir tier)
Result (failure): Red Fenrir may be lost OR materials only (check your server)

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Total material investment for Blue Fenrir estimate:

Pieces of Horn farmed: 40-80
JoChaos used: 8-16
JoB/JoS/JoL used: 5-10 each
Zen invested: 5,000,000-20,000,000
Time investment: 2-8 weeks of active Tarkan/Aida farming

Fenrir stats

Blue Fenrir bonuses:

Movement speed: high (comparable to or better than Dinorant)
Flying: YES (like Dinorant — traverses terrain)
Defense bonus: +80-200 physical defense (significantly higher than Dinorant)
Knockback immunity: YES
Damage boost: NONE (passive pet only)

Red Fenrir bonuses (all Blue + ):
Fenrir attack: the Fenrir itself deals damage to nearby enemies
→ Attack triggers automatically when enemies are adjacent
→ Damage: significant — adds meaningful DPS to your character's output
→ Particularly effective in close-combat situations (DK, DL, MG)

Black Fenrir bonuses (all Red + ):
All stats boosted further than Red
Special appearance: black wolf model

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Fenrir vs Dinorant comparison:

                Dinorant        Blue Fenrir     Red Fenrir      Black Fenrir
Movement:       Yes             Yes (faster)    Yes (faster)    Yes (fastest)
Flying:         Yes             Yes             Yes             Yes
Defense:        Medium          High            High            Very High
Knockback imm:  Yes             Yes             Yes             Yes
Damage:         None            None            Yes (attack)    Yes (attack+++)
Crafting diff:  Moderate        Hard            Very Hard       Extreme
Level range:    80-250          250+            End-game        Top 1%

The Dinorant remains:
→ The right choice while you farm Tarkan/Aida for Fenrir materials
→ Never wasteful — use it until you can equip the Fenrir
→ If you never obtain a Fenrir: the Dinorant is still excellent

Per-class analysis

Which classes benefit most from Fenrir:

Dark Knight (MAXIMUM value):
→ Red Fenrir's attack: adds to DK's already high physical damage
→ In melee combat: Fenrir attacks while DK attacks → highest total DPS
→ Defense bonus: DK takes hits → Fenrir's extra defense reduces HP loss
→ DK is the class that gets the most absolute benefit from Black Fenrir

Dark Lord (MAXIMUM value):
→ DL is primarily melee → same reasoning as DK
→ DL's CMD-based guild benefits persist regardless of pet
→ The Fenrir: combat power to complement the DL's support role

Magic Gladiator (very high value):
→ Hybrid class: Fenrir attack benefits both melee and magic modes
→ In melee mode: Fenrir adds damage
→ In magic mode: defense bonus still active

Dark Wizard (high value):
→ Blue Fenrir: defense bonus and speed (DW benefits from both)
→ Red Fenrir: Fenrir attack doesn't synergize as well (DW is range-based)
→ Still worthwhile: defense + speed are useful, attack is a bonus
→ DW priority: Blue Fenrir is great, Red/Black less urgent than for melee classes

Fairy Elf (high value):
→ Elf: low base defense → Fenrir's defense bonus is proportionally more impactful
→ Red Fenrir: Elf doesn't melee much → attack benefit is minor
→ Blue Fenrir: strongly recommended; Red/Black: lower priority than melee classes

Summoner (moderate-high value):
→ Summoner: similar to Elf reasoning
→ Defense boost: very welcome on the fragile Summoner
→ Red Fenrir attack: some value in close-range Summoner builds

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Priority order:

1. DK (highest — melee + defense)
2. DL (melee + command support role)
3. MG (hybrid benefits both combat modes)
4. DW (Blue Fenrir excellent; Red/Black lower priority)
5. Summoner (defense priority)
6. Elf (defense priority, attack least relevant)

See also the Dinorant guide (the pet to use while working toward Fenrir), the Tarkan farming guide (where Pieces of Horn drop), and the Chaos Goblin combinations guide (combination mechanics and failure rates).

Frequently asked questions