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Conquer Arcane Lineage Bosses: Ultimate Guide

Author:Kristen Update:Mar 14,2025

In *Arcane Lineage*, bosses range from solo-defeatable for new players to requiring multiple teams for the toughest challenges. Each boss presents unique mechanics, demanding strategic thinking and patience. Conquering these formidable foes yields some of the game's most coveted loot and items. This *Arcane Lineage* boss guide will equip you for the battles ahead.

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Table of Contents

Arcane Lineage Boss List

BossLocationDifficulty
**King Slime**Around the CityEasy
**Yar’thul, the Blazing Dragon**Inside Mount ThulNormal
**Thorian, the Rotten**Deep in the Cess GroundsHard
**Mettrom’s Vessel**Deeproot CanopyVery Hard
**Seraphon**Unlocked by ranking up in the Church of RaphionHard
**Arkhaia**Unlocked by ranking up in the Cult of ThanasiusVery Hard

King Slime

While considered a mini-boss, King Slime shouldn't be underestimated, especially by low-level players. 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 appears near the city closest to the last slain slime's location, announced on the Quest Board. The quest involves locating and killing King Slime, with a 30-minute global server cooldown.

King Slime Fighting Strategy

King Slime starts with 400 HP (600 HP if Corrupted), the lowest of any boss. Its primary attack is summoning more Slimes, which can overwhelm players. AOE poison attacks necessitate potions and cleansing abilities. Its low health allows for a straightforward battle; focus on eliminating summoned Slimes before attacking King Slime directly. AOE attacks only inflict poison, not direct damage.

AttacksEnergy CostEffect
**Slime Creation**1Summons a Slime to fight for King Slime.
**Crush**0King Slime lunges forward, attacking a party member.
**Poison Eruption**2King Slime throws out a burst of Acid, poisoning your party. This attack cannot be dodged or blocked.
**Scalding Spray**3King Slime erupts with boiling hot liquid, poisoning your party. This attack cannot be dodged.

King Slime Drops and Rewards

Defeating King Slime yields: Random Tier 1 Equipment, Slime Buckler, Gelat Ring. Quest Board rewards include: Ferrus Skin, Potion, Small Health Potion, Essence, Gold.

Yar’thul, the Blazing Dragon

This fire-type boss utilizes fire and inferno-based attacks. Its resistance to fire and physical damage, coupled with weakness to hex damage, requires strategic planning.

Yar’thul Location

Yar’thul resides deep within Mount Thul, an active volcano in the desert.

Yar’thul Fighting Strategy

Yar’thul boasts 1200 HP (1800 HP if Corrupted). Its high damage output, coupled with inferno and burning effects, makes this a race against time. Phase two, triggered below 50% health, involves summoned meteors that inflict stunning and healing reduction. Dragon Ring and pristine-level accessories are highly beneficial. The Corrupted version gains lifesteal.

AttacksEnergy CostEffect
**Inferno**0Automatically inflicted Inferno status effect at battle start. Undodgeable.
**Fire Claw**0Light damage fire-imbued claw attack.
**Magma Pillar**2Creates a magma pillar inflicting damage and Inferno/Burn stacks. Lasts 3 turns.
**Blaze Core**3Consumes Inferno stacks to heal.
**Blaze Eruption**2Damages burning targets and applies Inferno/Burning stacks.
**Magma Beam**4Massive damage beam attack, also damaging adjacent units. Undodgeable.
**Hellfire**1AOE fire wave inflicting Burning stacks. Undodgeable.
**Armageddon**6Below 50% health, summons a meteor inflicting massive damage, stun, and 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

Thorian, once an animal, is now a corrupted abomination vulnerable only to Holy damage, with resistance to most other elements.

Thorian Location

Thorian is located in the Deeproot Canopy within the Cess Grounds.

Thorian Fighting Strategy

Thorian has 2600 HP (3900 HP if Corrupted). A key mechanic involves alternating attack types; using the same type twice consecutively heals it. It’s highly vulnerable to Holy damage (135% damage increase) and slightly weak to fire (10% damage increase). Below 50% health, it unleashes a devastating attack inflicting Plague, Curse, and Hexed.

AttacksEnergy CostEffect
**Cursed Wave**2Damages 3 party members, chance to inflict Curse.
**Overflowing Curse**0Minigame; failure inflicts Plague. Undodgeable.
**Cess Breath**1AOE damage and debuffs.
**Warped Crush**1Damages 3 party members.
**Blasphemous Obliteration**5Below 50% health, inflicts Plague, Curse, and Hexed. Undodgeable.
**Hexed Burst**1AOE damage, chance to apply random debuffs.
**Plague Rupture**2Applies a random debuff then deals massive damage scaling with 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

Metrom’s Vessel, a raid boss, requires a Void Key (obtained from defeating corrupted versions of previous bosses) and spawns on a global timer.

Metrom’s Vessel Location

Location is announced server-wide upon spawn.

Metrom’s Vessel Fighting Strategy

This boss is characterized by extremely high health (10,000 HP, 15,000 HP if Corrupted) and damage negation. It has two phases with distinct mechanics. Phase one involves destroying wings to reduce damage negation but increase damage output. Phase two changes wing mechanics (offensive and defensive modes) and introduces a Mini Shadebringer. Coordination and consistent debuff application are crucial for success.

Phase 1 Attacks

AttacksEnergy CostEffect
**Rendering Slash**0Damages and applies Weakness stacks.
**Deathbound**1Applies Sundered stacks to 2 random players.
**Eclipse**1Applies a buff to itself.
**Invoke Shadeblades**3Summons two Shadeblades (200 HP each). Undodgeable.
**Hexed Rend**3AOE debuffing slash. Undodgeable.
**Oblivion**5Deals 50% of everyone’s HP and inflicts Curse. Undodgeable.

Phase 2 Attacks

AttacksEnergy CostEffect
**Oblivion + Eclipse**1Rendering Slash (P1) followed by Hexed Rend (P1).
**