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Complete Arcane Lineage Boss Guide – How to Beat Them All

Author : Victoria

Mar 18,2025

From solo-able pushovers to multi-team challenges, *Arcane Lineage*'s bosses offer diverse and engaging encounters. Each boss boasts unique mechanics demanding strategic thinking and patience for a successful takedown. Conquering these formidable foes rewards players with some of the game's most coveted loot and items. This *Arcane Lineage* boss guide will equip you for the battles ahead.

Arcane Lineage Boss List

Boss	Location	Difficulty
King Slime	Around the City	Easy
Yar’thul, the Blazing Dragon	Inside Mount Thul	Normal
Thorian, the Rotten	Deep in the Cess Grounds	Hard
Mettrom’s Vessel	Deeproot Canopy	Very Hard
Seraphon	Unlocked by ranking up in the Church of Raphion	Hard
Arkhaia	Unlocked by ranking up in the Cult of Thanasius	Very Hard

King Slime

While technically a boss, King Slime is more of a mini-boss, posing little threat to experienced players. However, lower-level players should proceed with caution. Note that soul points cannot be obtained from this boss.

King Slime Location

King Slime spawns after 100 Slimes are killed on the server. It will appear near the city closest to the last slain slime's location. A notice on the Quest Board announces the King Slime quest activation. The quest has two steps: Find the King Slime; Kill the King Slime. This quest has a 30-minute global server cooldown.

King Slime Fighting Strategy

King Slime spawns with 400 HP (600 HP if Corrupted), the lowest of any boss in *Arcane Lineage*. Its primary attack is summoning more Slimes, which can overwhelm parties over time. It also uses AoE poison attacks, so potions and cleansing abilities are recommended. Its low health allows for a straightforward fight. Focus on eliminating summoned Slimes before attacking the King Slime. Its AoE attacks only inflict poison, not direct damage.

Attacks	Energy Cost	Effect
Slime Creation	1	Summons a Slime.
Crush	0	Attacks a party member.
Poison Eruption	2	Poisons the party. Undodgeable.
Scalding Spray	3	Poisons the party. Undodgeable.

King Slime Drops and Rewards

Possible drops: Random Tier 1 Equipment, Slime Buckler, Gelat Ring. Quest rewards: Ferrus Skin, Potion, Small Health Potion, Essence, Gold.

Yar’thul, the Blazing Dragon

A fire-type boss utilizing fire-based attacks. Most attacks inflict Inferno and Burning, making unprepared parties vulnerable. Resistant to fire and physical damage, weak to Hex damage.

Yar’thul Location

Found deep within Mount Thul, an active volcano in the desert.

Yar’thul Fighting Strategy

Yar’thul has 1200 HP (1800 HP if Corrupted). Its high damage output makes it a race against time. Below 50% health, it enters a second phase, summoning meteors that inflict stunning and healing reduction. The Dragon Ring and Pristine-level accessories ease this fight. The Corrupted version gains lifesteal.

Attacks	Energy Cost	Effect
Inferno	0	Inflicts Inferno. Undodgeable.
Fire Claw	0	Light damage.
Magma Pillar	2	Creates a magma pillar inflicting Inferno and Burn.
Blaze Core	3	Heals based on consumed Inferno stacks.
Blaze Eruption	2	Damages burning targets, applies Inferno and Burning stacks.
Magma Beam	4	Massive damage. Undodgeable.
Hellfire	1	Light damage, applies Burning stacks. Undodgeable.
Armageddon	6	Summons a meteor, massive damage, stun, healing reduction. Undodgeable.

Yar’thul Drops and Rewards

Guaranteed rewards: Absolute Radiance, Permafrost Curse, Wild Impulse, Heavenly Prayer, Breath of Fungyir, Narhana’s Sigil, Reality Watch, Shifting Hourglass, Ring of the Dragon, The Void Key (Corrupted Yar’thul). Possible drops: Dragontooth Blade, Dragonbone Gauntlets, Dragonbone Spear, Dragonflame Shield, Memory Fragment, Soul Dust, Phoenix Tear, Resplendant Essence, Lineage Shard, Skyward Totem.

Thorian, the Rotten

A corrupted creature resistant to most elements but heavily weak to Holy damage.

Thorian Location

Found in the Deeproot Canopy within the Cess Grounds.

Thorian Fighting Strategy

Thorian has 2600 HP (3900 HP if Corrupted). Attacking twice with the same attack type causes it to heal 150% of the damage dealt. It is heavily weak to Holy damage and slightly weak to fire. Below 50% health, it unleashes a devastating attack inflicting Plague, Curse, and Hexed.

Attacks	Energy Cost	Effect
Cursed Wave	2	Damages 3 party members, chance to inflict Curse.
Overflowing Curse	0	Minigame; failure inflicts Plague. Undodgeable.
Cess Breath	1	AOE damage and debuffs.
Warped Crush	1	Damages 3 party members.
Blasphemous Obliteration	5	Inflicts Plague, Curse, and Hexed. Undodgeable.
Hexed Burst	1	AOE damage, chance to apply debuffs.
Plague Rupture	2	Applies a random debuff, then deals massive damage based on debuff count.

Thorian Drops and Rewards

Guaranteed rewards: Absolute Radiance, Permafrost Curse, Wild Impulse, Heavenly Prayer, Breath of Fungyir, Stellian Core, Metrom’s Amulet, Darksigil Ring of Blight, The Void Key (Corrupted Thorian). Possible drops: Blightrock Dagger, Blightwood Staff, Memory Fragment, Soul Dust, Phoenix Tear, Resplendant Essence, Lineage Shard, Skyward Totem.

Metrom’s Vessel

A raid boss requiring a Void Key (obtained from corrupted bosses) and spawning on a global timer.

Metrom’s Vessel Location

Spawns globally based on a timer, location announced server-wide.

Metrom’s Vessel Fighting Strategy

Metrom's Vessel has 10,000 HP (15,000 HP if Corrupted). It has two phases with different mechanics. The first phase involves destroying its wings to reduce damage negation. In the second phase, the wings gain offensive and defensive modes. It also summons Shadeblades. Oblivion deals 50% max HP damage. Coordination and consistent debuff application are crucial.

Phase 1 Attacks

Attacks	Energy Cost	Effect
Rendering Slash	0	Damage, applies Weakness.
Deathbound	1	Applies Sundered to 2 players.
Eclipse	1	Self-buff.
Invoke Shadeblades	3	Summons Shadeblades. Undodgeable.
Hexed Rend	3	AOE debuff. Undodgeable.
Oblivion	5	50% HP damage, Curse. Undodgeable.

Phase 2 Attacks

Attacks	Energy Cost	Effect
Oblivion + Eclipse	1	Rendering Slash then Hexed Rend.
Unyielding Fury	2	AOE debuff (Blind, Hexed). Undodgeable.
Minishade Bringer	3	Summons Shadebringers. Undodgeable.
Shadebringer	1	AOE damage, Cursed stacks. Undodgeable.
Blackout	2	AOE debuff. Undodgeable.

Metrom’s Vessel Drops and Rewards

Guaranteed rewards: Metrom’s Grasp, Chaos Orb, Expedite Anklet, Echo Shard, Tempurus Gem, Arcanium Crystal. Possible drops: Darkblood Staff, Darkblood Dagger, Darkblood Spear, Darkblood Hexer, Darkblood Sword, Darkblood Cestus.

Arkhaia and Seraphon

Rare, challenging bosses not recommended for beginners. Arkhaia (7000 HP) is unlocked at rank 20 in the Cult of Thanasius and offers the Inferion race upon defeat. Seraphon (4500 HP) is unlocked at rank 20 in the Church of Raphion and offers the Sheea race upon defeat.

This concludes the *Arcane Lineage* Boss Guide. Looking to boost your power? Check out our Complete Arcane Lineage Class Tier List and Guide.