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"Defeating All Arcane Lineage Bosses: Ultimate Guide"

by Lucy May 14,2025

In Arcane Lineage, the variety of bosses presents a thrilling challenge to players of all skill levels. From the easy-to-defeat King Slime, perfect for beginners, to the formidable Metrom's Vessel, requiring multiple teams and extensive preparation, each boss offers unique mechanics and strategies. Conquering these bosses rewards players with some of the game's most coveted loot and items, making it essential to master these encounters. This comprehensive guide will equip you with the knowledge needed to tackle these formidable foes.

Arcane Lineage Boss List

King Slime

King Slime is considered a mini-boss due to its relative ease compared to other bosses in Arcane Lineage. However, it remains a challenge for low-level players. It's worth noting that defeating King Slime does not yield soul points.

King Slime Location

King Slime spawns after 100 Slimes are defeated on the server, appearing around the city closest to the last slain slime. Players are notified via the Quest Board when the King Slime quest is active, which involves two steps:

  1. Find the King Slime
  2. Kill the King Slime

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

King Slime Fighting Strategy

With a base of 400 HP (600 HP if Corrupted), King Slime's health is the lowest among all bosses. It primarily attacks by summoning more Slimes, which can overwhelm the party if not managed quickly. Additionally, King Slime uses AOE poison attacks, making it advisable to bring potions and cleansing abilities. Its attacks only inflict Poisoned status without direct damage, allowing for a more straightforward battle once the summoned Slimes are dealt with.

King Slime Attacks:

AttacksEnergy CostEffect
Slime Creation1Summons a Slime to fight for King Slime.
Crush0King Slime lunges forward, attacking a party member.
Poison Eruption2Throws out a burst of Acid, poisoning the party. Cannot be dodged.
Scalding Spray3Erupts with boiling hot liquid, poisoning the party. Cannot be dodged.
King Slime Drops and Rewards

Upon defeating King Slime, players can receive:

  • Random Tier 1 Equipment
  • Slime Buckler
  • Gelat Ring

Completing the King Slime quest from the Quest Board rewards:

  • Ferrus Skin Potion
  • Small Health Potion
  • Essence
  • Gold

Yar’thul, the Blazing Dragon

Yar’thul is a fire-type boss that utilizes Fire and Inferno-based attacks, making it a challenging fight due to its Inferno and Burning effects. It's resistant to fire and physical damage but weak to Hex damage.

Yar’thul Location

To face Yar’thul, travel deep into the Desert to find Mount Thul, an active volcano. Navigate through the dark corridors within Mount Thul to reach the Blazing Dragon.

Yar’thul Fighting Strategy

With 1200 HP (1800 HP if Corrupted), Yar’thul compensates for its lack of tankiness with high damage output. Most of its attacks apply Inferno and Burning effects, turning the battle into a race against time. When its health drops below 50%, Yar’thul enters a second phase, summoning meteors that stun and apply healing reduction. The Corrupted version gains lifesteal, making it even more challenging.

Yar’thul Attacks:

AttacksEnergy CostEffect
Inferno0Automatically inflicts Inferno status effect on the party. Cannot be dodged.
Fire Claw0Slashes with fire-imbued claws, dealing light damage.
Magma Pillar2Creates a magma pillar, damaging and inflicting Inferno and Burn stacks.
Blaze Core3Consumes the party's Inferno stacks, healing based on the amount consumed.
Blaze Eruption2Slams arms into the ground, damaging burning targets and applying Inferno and Burning stacks.
Magma Beam4Charges a devastating fire beam for massive damage. Cannot be dodged.
Hellfire1Sends out a wave of fire, damaging the party and applying Burning stacks. Cannot be dodged.
Armageddon6Below 50% health, summons meteors that devastate the party, apply healing reduction, and may stun. Cannot be dodged.
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 (from Corrupted Yar’thul)

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

Once an animal from the Deeproot Canopy, Thorian became a corrupted abomination with many red eyes and tentacles. It's resistant to most elements but highly vulnerable to Holy damage.

Thorian Location

Thorian resides in the furthest reaches of the Cess Grounds within the Deeproot Canopy. Head to the right side of the Cess Grounds to encounter this towering enemy.

Thorian Fighting Strategy

With 2600 HP (3900 HP if Corrupted), Thorian's battle involves unique mechanics. Its passive negates healing if the same attack type is used consecutively, requiring varied attack types. Thorian is resistant to almost all damage types except Holy, which deals 135% damage. Below 50% health, Thorian unleashes a devastating attack, inflicting Plague, Curse, and Hexed status effects.

Thorian Attacks:

AttacksEnergy CostEffect
Cursed Wave2Attacks 3 party members, dealing damage with a chance to inflict Curse.
Overflowing Curse0Starts a minigame; failing inflicts Plague. Cannot be dodged or blocked.
Cess Breath1Sends a wave of rotten air, dealing AOE damage and debuffing the party.
Warped Crush1Charges at the party, dealing damage to 3 party members.
Blasphemous Obliteration5Below 50% health, devastates the party with Plague, Curse, and Hexed. Cannot be dodged.
Hexed Burst1Sends out an AOE wave with a chance to apply random debuffs.
Plague Rupture2Gives a party member a random debuff, then ruptures them for massive damage.
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 (from Corrupted Thorian)

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 is now a Raid Boss sealed in a Temporal Jail. It spawns on a global timer and requires a Void Key to challenge, which can be obtained from defeating corrupted versions of other bosses.

Metrom’s Vessel Location

As a Raid Boss, Metrom’s Vessel spawns on a global timer. Players need a Void Key to enter the fight, and the server-wide notification indicates its location.

Metrom’s Vessel Fighting Strategy

With 10,000 HP (15,000 HP if Corrupted), Metrom’s Vessel is a true statpile requiring 30 to 60 minutes to defeat. It has two phases with different mechanics. In the first phase, its black wings grant damage negation, requiring status effects to destroy them. The fewer wings, the more damage it deals, so timing is crucial. Metrom’s Vessel also summons Shadeblades, which must be quickly dispatched. The longer the fight, the higher the chance it will use Oblivion, dealing massive damage.

In the second phase, after shattering the Temporal Jail, its wings gain Offensive and Defensive modes, affecting its damage output and resistance. It also summons Mini Shadebringers, adding more pressure to the battle. Coordination and constant debuff application are key to overcoming this challenging boss.

Phase 1 Attacks:

AttacksEnergy CostEffect
Rendering Slash0Lunges at the player, dealing damage and applying Weakness stacks.
Deathbound1Applies Sundered stacks to 2 random players.
Eclipse1Applies a buff onto itself.
Invoke Shadeblades3Summons two Shadeblades with 200 HP each. Cannot be dodged.
Hexed Rend3An undodgeable AOE slash that debuffs all players. Cannot be dodged.
Oblivion5Uses ancient magic, dealing 50% of everyone’s HP and inflicting Curse. Cannot be dodged.

Phase 2 Attacks:

AttacksEnergy CostEffect
Oblivion + Eclipse1Uses Rendering Slash followed by Hexed Rend.
Unyielding Fury2An AOE debuff that applies Blind and Hexed stacks. Cannot be dodged.
Minishade Bringer3Shoots 3 Shadebringers. Cannot be dodged.
Shadebringer1Slashes 3 Shadebringers, hitting the party and applying Cursed stacks. Cannot be dodged.
Blackout2Debuffs the whole party. Cannot be dodged.
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 serve as the final bosses in the current development phase.

Arkhaia is unlocked by reaching rank 20 in the Cult of Thanasius. It has 7000 HP and features a damage-over-time mechanic. Defeating Arkhaia allows players to start a new character with the Inferion race.

Seraphon is unlocked by reaching rank 20 in the Church of Raphion. With 4500 HP, defeating Seraphon offers the chance to start a new character with the Sheea race.

Conclusion

This guide provides essential strategies and information for tackling the diverse bosses in Arcane Lineage. Whether you're facing the relatively straightforward King Slime or the complex mechanics of Metrom’s Vessel, understanding these bosses' unique challenges will enhance your gameplay and reward you with valuable loot. For further improvement, explore our Complete Arcane Lineage Class tier list and guide to become more powerful in your adventures.