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Complete Arcane Lineage Boss Guide – How to Beat Them All

Author：Kristen Update：Mar 29,2025

In Arcane Lineage, the variety of bosses ranges from those that even a novice player can tackle solo to formidable foes that require coordinated efforts from multiple teams. Each boss presents unique challenges and mechanics, demanding strategic planning and patience to conquer. Overcoming these bosses rewards players with some of the game's most coveted loot and items. Dive into our comprehensive Arcane Lineage Boss guide to gear up for these epic encounters.

Arcane Lineage Boss List

King Slime

King Slime is more of a mini-boss, less threatening than other bosses in Arcane Lineage. However, it remains a challenge for low-level players. Note that defeating this boss does not yield soul points.

King Slime Location

King Slime spawns after 100 Slimes are defeated on the server. It appears around the city nearest to where the last slime was killed, with a notification on the Quest Board signaling the start of the King Slime quest. The quest involves two steps:

Find the King Slime
Kill the King Slime

This quest has a 30-minute global cooldown on the server.

King Slime Fighting Strategy

With 400 HP (600 HP if Corrupted), King Slime has the lowest health among bosses. Its primary tactic is to summon additional Slimes that can overwhelm your party. It also employs AOE poison attacks, so come equipped with potions and cleansing abilities. After dealing with the summoned Slimes, you can defeat King Slime in a few turns. Its AOE attacks only apply the Poisoned status without direct damage, giving you room to attack.

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

Upon defeating King Slime, you may receive:

Random Tier 1 Equipment
Slime Buckler
Gelat Ring

Completing the King Slime event from the Quest Board can reward you with:

Ferrus Skin Potion
Small Health Potion
Essence
Gold

Yar’thul, the Blazing Dragon

Yar’thul is a fire-type boss that uses Fire and Inferno-based attacks, inflicting Inferno and Burning stacks on the party. It's resistant to fire and physical damage but weak to Hex damage.

Yar’thul Location

To encounter Yar’thul, venture deep into the Desert to Mount Thul, an active volcano formed by Yar’thul’s heat. Navigate through the dark corridors to confront the Blazing Dragon at the end.

Yar’thul Fighting Strategy

With 1200 HP (1800 HP if Corrupted), Yar’thul compensates for its lower health with high damage output. Most of its attacks apply Inferno and Burning effects, making the fight challenging without proper preparation. Below 50% health, it enters a second phase, summoning meteors that stun and reduce healing. The Dragon Ring and Pristine-level accessories can ease this battle. The Corrupted version gains lifesteal.

Attacks	Energy Cost	Effect
Inferno	0	Automatically inflicts the Inferno status effect at the start of the battle. This attack cannot be dodged or blocked.
Fire Claw	0	Yar’thul slashes with fire-imbued claws, dealing light damage.
Magma Pillar	2	Yar’thul slams the ground, creating a magma pillar that damages and inflicts 2 stacks of Inferno and 5 stacks of Burn for 3 turns.
Blaze Core	3	Yar’thul consumes the party's Inferno stacks, healing based on the amount consumed.
Blaze Eruption	2	Yar’thul slams its arms, damaging burning targets and applying scaling Inferno and Burning stacks.
Magma Beam	4	Yar’thul charges a devastating fire beam for 1 turn, then fires it for massive damage, also affecting adjacent units. This attack cannot be dodged or blocked.
Hellfire	1	Yar’thul sends out a wave of fire, damaging the whole party and applying 9 stacks of Burning. This attack cannot be dodged or blocked.
Armageddon	6	Below 50% health, Yar’thul may summon a meteor, dealing massive damage, applying healing reduction, and potentially stunning the party. This attack cannot be dodged or blocked.

Yar’thul Drops and Rewards

Defeating Yar’thul guarantees:

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 (if Corrupted)

Possible drops include:

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 in the Deeproot Canopy, has become a corrupted abomination with many red eyes and tentacles. It curses anything it touches and is resistant to most elements but weak to Holy damage.

Thorian Location

Find Thorian in the Cess Grounds within the Deeproot Canopy. Head right upon entering and continue in that direction; you won't miss this towering enemy.

Thorian Fighting Strategy

With 2600 HP (3900 HP if Corrupted), Thorian presents a complex fight with unique mechanics. Its passive negates healing if you use the same attack type consecutively, requiring varied attacks. It's resistant to most damage types except Holy, which deals 135% damage. Below 50% health, it unleashes a devastating attack, applying Plague, Curse, and Hexed with a 15-turn cooldown.

Attacks	Energy Cost	Effect
Cursed Wave	2	Thorian attacks 3 party members, dealing damage with a chance to inflict Curse.
Overflowing Curse	0	Starts a minigame; failure inflicts Plague. This attack cannot be dodged or blocked.
Cess Breath	1	Thorian sends a wave of rotten air, dealing AOE damage and debuffing the party.
Warped Crush	1	Thorian charges the party, dealing damage to 3 party members.
Blasphemous Obliteration	5	Below 50% health, Thorian devastates the party, applying 1 stack of Plague, 3 stacks of Curse, and 1 stack of Hexed. This attack cannot be dodged or blocked.
Hexed Burst	1	Thorian sends out a small AOE wave, damaging the party with a chance to apply random debuffs (1 Hexed or 3 Curse).
Plague Rupture	2	Thorian gives a party member a random debuff, then ruptures them, dealing massive damage scaling with the number of debuffs.

Thorian Drops and Rewards

Defeating Thorian guarantees:

Absolute Radiance
Permafrost Curse
Wild Impulse
Heavenly Prayer
Breath of Fungyir
Stellian Core
Metrom’s Amulet
Darksigil
Ring of Blight
The Void Key (if Corrupted)

Possible drops include:

Blightrock Dagger
Blightwood Staff
Memory Fragment
Soul Dust
Phoenix Tear
Resplendant Essence
Lineage Shard
Skyward Totem

Metrom’s Vessel

Once a hero, Metrom’s Vessel now serves as a vessel for Metrom, sealed in a Temporal Jail. This significantly weakens him, but he remains a formidable Raid Boss.

Metrom’s Vessel Location

Metrom’s Vessel spawns on a global timer and requires a Void Key, obtained by defeating corrupted versions of other bosses. Wait for the server-wide notification to learn its location.

Metrom’s Vessel Fighting Strategy

With 10,000 HP (15,000 HP if Corrupted), Metrom’s Vessel is a statpile with high damage negation, requiring 30 to 60 minutes to defeat. It has two phases with different moves and mechanics. In the first phase, its black wings grant damage negation; destroying them increases its damage output. It also summons Shadeblades with 200 HP each. The longer the first phase lasts, the higher the chance it will use Oblivion, dealing 50% max HP to everyone.

In the second phase, after the Temporal Jail shatters, its wings switch between Offensive and Defensive modes. Offensive mode increases damage and minion damage, while Defensive mode provides high damage resistance and Thorns Aura. A Mini Shadebringer attacks when a player fails to dodge. Coordination and constant debuff application are key to victory.

Phase 1 Attacks

Attacks	Energy Cost	Effect
Rendering Slash	0	Metrom’s Vessel lunges, damaging the player and applying 3 Weakness stacks.
Deathbound	1	Metrom’s Vessel applies 3 stacks of Sundered to 2 random players.
Eclipse	1	Metrom’s Vessel buffs itself.
Invoke Shadeblades	3	Metrom’s Vessel summons two Shadeblades with 200 HP each. This attack cannot be dodged or blocked.
Hexed Rend	3	An undodgeable AOE slash that debuffs all players. This attack cannot be dodged or blocked.
Oblivion	5	Metrom’s Vessel uses ancient magic, dealing 50% of everyone’s HP and inflicting Curse. This attack cannot be dodged or blocked.

Phase 2 Attacks

Attacks	Energy Cost	Effect
Oblivion + Eclipse	1	Metrom’s Vessel uses Rendering Slash followed by Hexed Rend.
Unyielding Fury	2	An AOE debuff that gives all players 3 stacks of Blind and 2 stacks of Hexed. This attack cannot be dodged or blocked.
Minishade Bringer	3	Metrom’s Vessel shoots 3 Shadebringers. This attack cannot be dodged or blocked.
Shadebringer	1	Metrom’s Vessel slashes 3 Shadebringers, hitting the whole party and applying 4 stacks of Cursed. This attack cannot be dodged or blocked.
Blackout	2	Metrom’s Vessel debuffs the whole party. This attack cannot be dodged or blocked.

Metrom’s Vessel Drops and Rewards

Defeating Metrom’s Vessel guarantees:

Metrom’s Grasp
Chaos Orb
Expedite Anklet
Echo Shard
Tempurus Gem
Arcanium Crystal

Possible drops include:

Darkblood Staff
Darkblood Dagger
Darkblood Spear
Darkblood Hexer
Darkblood Sword
Darkblood Cestus

Arkhaia and Seraphon

Arkhaia and Seraphon are rare and challenging bosses with complex mechanics, not recommended for beginners. They are the final bosses in the current development stage.

To unlock Arkhaia, reach rank 20 in the Cult of Thanasius. Arkhaia has 7000 HP and uses a damage-over-time gimmick. Defeating it allows you to start a new character with the Inferion race, a powerful and rare starting race in Arcane Lineage.

To unlock Seraphon, reach rank 20 in the Church of Raphion. Seraphon has 4500 HP. Defeating it allows you to start a new character with the Sheea race, another powerful and rare starting race in Arcane Lineage.

And that concludes our Arcane Lineage Boss guide. For more insights on enhancing your gameplay, explore our Complete Arcane Lineage Class tier list and guide.

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