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Complete Arcane Lineage Boss Guide – How to Beat Them All

by Nicholas Mar 06,2025

This Arcane Lineage boss guide details strategies and rewards for each boss encounter, ranging from easily soloable to requiring multiple teams. Defeating these bosses yields some of the game's best loot.

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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
Metrom’s Vessel	Deeproot Canopy	Very Hard
Seraphon	Church of Raphion (Rank 20)	Hard
Arkhaia	Cult of Thanasius (Rank 20)	Very Hard

King Slime

King Slime Image 1 King Slime Image 2 King Slime Image 3

While considered a mini-boss, King Slime shouldn't be underestimated by low-level players. Note: no soul points are awarded for this boss.

King Slime Location: Spawns after 100 Slimes die on the server, near the city where the last Slime was killed. A Quest Board notification announces its appearance. The quest involves locating and defeating the King Slime (30-minute server cooldown).

King Slime Fighting Strategy: King Slime has 400 HP (600 if Corrupted). Its main attack involves summoning Slimes. It also uses AOE poison attacks; potions and cleansing abilities are recommended. Focus on eliminating summoned Slimes before attacking King Slime. Its AOE attacks inflict Poison but minimal direct damage.

Attacks	Energy Cost	Effect
Slime Creation	1	Summons a Slime.
Crush	0	Attacks a party member.
Poison Eruption	2	AOE poison attack; undodgeable.
Scalding Spray	3	AOE poison attack; undodgeable.

King Slime Drops and Rewards:

Random Tier 1 Equipment
Slime Buckler
Gelat Ring
Quest Rewards: Ferrus Skin Potion, Small Health Potion, Essence, Gold

Yar’thul, the Blazing Dragon

Yar'thul Image 1 Yar'thul Image 2 Yar'thul Image 3

A fire-type boss using fire-based attacks inflicting Inferno and Burning. Resistant to fire and physical damage; weak to Hex.

Yar’thul Location: Mount Thul, a volcano in the Desert.

Yar’thul Fighting Strategy: 1200 HP (1800 if Corrupted). High damage output; most attacks inflict Inferno and Burning. Below 50% health, it summons meteors inflicting stun and healing reduction. Dragon Ring and Pristine-level accessories are helpful. Corrupted version has lifesteal.

Attacks	Energy Cost	Effect
Inferno	0	Automatic; inflicts Inferno; undodgeable.
Fire Claw	0	Light damage.
Magma Pillar	2	Creates a magma pillar; damage and Inferno/Burn stacks to attackers.
Blaze Core	3	Heals based on consumed Inferno stacks.
Blaze Eruption	2	Damages burning targets; applies Inferno/Burn stacks.
Magma Beam	4	Massive damage; undodgeable.
Hellfire	1	Light AOE damage; applies Burning stacks; undodgeable.
Armageddon	6	(Below 50% HP) Summons a meteor; massive damage, stun, healing reduction; undodgeable.

Yar’thul Drops and Rewards:

Guaranteed: 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: Dragontooth Blade, Dragonbone Gauntlets, Dragonbone Spear, Dragonflame Shield, Memory Fragment, Soul Dust, Phoenix Tear, Resplendant Essence, Lineage Shard, Skyward Totem

(Continued in next response due to character limits)

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