In Arcane Lineage, boss encounters range from solo-able challenges for newcomers to epic battles requiring multiple teams. Each boss presents unique mechanics, demanding strategic thinking and patience for a successful takedown. The rewards are well worth the effort, though—defeating these bosses grants access to some of the game's most coveted loot and items. This guide will equip you for the challenges ahead.
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Table of Contents
- Arcane Lineage Boss List
- King Slime
- Yar’thul, the Blazing Dragon
- Thorian, the Rotten
- Metrom’s Vessel
- Arkhaia and Seraphon
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 considered a mini-boss, the King Slime shouldn't be underestimated, especially by lower-level players. Note that this boss does not yield soul points.
King Slime Location
The King Slime spawns after 100 Slimes are defeated on the server. It appears near the city closest to the last slain slime's location, announced on the Quest Board. The quest has two steps: find and kill the King Slime. This quest has a 30-minute global server cooldown.
King Slime Fighting Strategy
The King Slime has 400 HP (600 HP if Corrupted), the lowest of any boss. Its main attack involves summoning additional Slimes, which can overwhelm players if not dealt with promptly. It also uses AoE poison attacks, so potions and cleansing abilities are recommended. Its low health makes the battle relatively straightforward: focus on eliminating the summoned Slimes before attacking the King Slime itself. Its AoE attacks only inflict poison, not direct damage, providing opportunities for counterattacks.
| Attacks | Energy Cost | Effect | 
|---|---|---|
| **Slime Creation** | 1 | Summons a Slime to fight for King Slime. | 
| **Crush** | 0 | King Slime lunges forward, attacking a party member. | 
| **Poison Eruption** | 2 | King Slime throws out a burst of Acid, poisoning your party. This attack cannot be dodged or blocked. | 
| **Scalding Spray** | 3 | King Slime erupts with boiling hot liquid, poisoning your party. This attack cannot be dodged. | 
King Slime Drops and Rewards
Possible drops from defeating the King Slime include: Random Tier 1 Equipment, Slime Buckler, Gelat Ring.
Quest Board rewards for completing the King Slime event: Ferrus Skin, Potion, Small Health Potion, Essence, Gold.
Yar’thul, the Blazing Dragon



Yar’thul is a fire-type boss whose attacks inflict Inferno and Burning status effects, making preparation crucial. It's resistant to fire and physical damage but weak to Hex damage.
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 and Inferno/Burning effects make it a race against time. Upon reaching 50% health, it enters a second phase, summoning meteors that inflict stuns and healing reduction. The Dragon Ring and Pristine-level accessories significantly ease this battle. The Corrupted version gains lifesteal.
| Attacks | Energy Cost | Effect | 
|---|---|---|
| **Inferno** | 0 | Automatically inflicted at the start, applying the Inferno status effect. Undodgeable. | 
| **Fire Claw** | 0 | Yar’thul slashes with fire-imbued claws, dealing light damage. | 
| **Magma Pillar** | 2 | Creates a magma pillar, damaging and inflicting Inferno and Burn stacks on those who attack through it (lasts 3 turns). | 
| **Blaze Core** | 3 | Yar’thul consumes Inferno stacks to heal. | 
| **Blaze Eruption** | 2 | Damages burning targets and applies Inferno and Burning stacks. | 
| **Magma Beam** | 4 | Charges a devastating beam (1 turn charge, massive damage on the next turn), also damaging adjacent units. Undodgeable. | 
| **Hellfire** | 1 | A wave of fire dealing light damage and applying Burning stacks. Undodgeable. | 
| **Armageddon** | 6 | (Below 50% health) Summons a meteor inflicting massive damage, healing reduction, and a chance to stun. 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 monstrosity resistant to most elements but heavily weak to Holy damage.
Thorian Location
Thorian is found in the Deeproot Canopy within the Cess Grounds.
Thorian Fighting Strategy
Thorian has 2600 HP (3900 HP if Corrupted). A key mechanic involves its passive negation: attacking twice with the same type heals it. Vary your attack types. It's highly resistant to all damage except Holy (135% damage) and slightly weak to fire. Below 50% health, it unleashes a devastating attack inflicting Plague, Curse, and Hexed (15-turn cooldown).
| Attacks | Energy Cost | Effect | 
|---|---|---|
| **Cursed Wave** | 2 | Attacks 3 party members, chance to inflict Curse. | 
| **Overflowing Curse** | 0 | Mini-game; failure inflicts Plague. Undodgeable. | 
| **Cess Breath** | 1 | AOE damage and debuffs. | 
| **Warped Crush** | 1 | Damages 3 party members. | 
| **Blasphemous Obliteration** | 5 | (Below 50% health) Devastating AOE attack inflicting Plague, Curse, and Hexed. Undodgeable. | 
| **Hexed Burst** | 1 | Small AOE, chance to apply random debuffs. | 
| **Plague Rupture** | 2 | Applies a random debuff, then 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 corrupted bosses) and spawns on a global timer.
Metrom’s Vessel Location
Location announced server-wide after spawning.
Metrom’s Vessel Fighting Strategy
Metrom’s Vessel is characterized by extremely high HP (10,000 HP, 15,000 HP if Corrupted) and damage negation. The fight is long (30-60 minutes) and involves two phases with different mechanics. Phase 1 focuses on destroying its wings to reduce damage negation, while Phase 2 introduces offensive and defensive wing modes and the summoning of Shadeblades. Careful coordination and consistent debuff application are key to victory.
Phase 1 Attacks
| Attacks | Energy Cost | Effect | 
|---|---|---|
| **Rendering Slash** | 0 | Damages and applies Weakness stacks. | 
| **Deathbound** | 1 | Applies Sundered stacks to 2 random players. | 
| **Eclipse** | 1 | Applies a buff to Metrom’s Vessel. | 
| **Invoke Shadeblades** | 3 | Summons two Shadeblades (200 HP each). Undodgeable. | 
| **Hexed Rend** | 3 | AOE slash, debuffs all players. Undodgeable. | 
| **Oblivion** | 
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