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Arcane Lineage Bosses: Ultimate Defeat Guide

Author:Kristen Update:Jun 24,2025

In *Arcane Lineage*, bosses range from beginner-friendly challenges to encounters that demand well-coordinated teams and deep strategic thinking. Each boss brings a unique set of mechanics, testing not only your combat skills but also your adaptability and preparation. Slaying them rewards you with some of the most powerful gear and rare items in the game. Whether you're just starting out or fine-tuning your endgame strategy, this guide will walk you through everything you need to know about each boss encounter.

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Arcane Lineage Boss List

BossLocationDifficulty
King SlimeAround the CityEasy
Yar’thul, the Blazing DragonInside Mount ThulNormal
Thorian, the RottenDeep in the Cess GroundsHard
Metrom’s VesselDeeproot CanopyVery Hard
SeraphonUnlocked by ranking up in the Church of RaphionHard
ArkhaiaUnlocked by ranking up in the Cult of ThanasiusVery Hard

King Slime

King SlimeKing SlimeKing Slime

While King Slime is technically classified as a mini-boss due to its relatively low threat level, it can still be dangerous for underprepared players. It does not grant soul points, so consider this fight more of a team-building exercise than a power-leveling opportunity.

King Slime Location

The King Slime spawns after 100 regular slimes are defeated on the server. Its spawn location depends on where the last slime was killed—usually near the closest city. A notification will appear on the Quest Board, indicating that the King Slime event is active. The quest includes two objectives:

  • Locate the King Slime
  • Defeat the King Slime

This event has a 30-minute global cooldown, so plan accordingly.

King Slime Fighting Strategy

With only 400 HP (or 600 if corrupted), King Slime