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Relentless Arduran is a quest-exclusive Unique Monster and Boss in Xenoblade Chronicles 2. It is a member of the Ardun family and can be found at level 99 at Kloom Farm in Gormott Province after supplying Pekka with a certain amount of food for his Ardun. It will respawn after checking the named tombstone.

Despite all of the Ardun forms leading up to Relentless Arduran, it has the appearance of a Balgas. This may imply that Balgas are the same species as Armus and Arduns and probably a dominant male (Ardun) in Xenoblade Chronicles 2.

If the Ardun is killed before he grows into Relentless Arduran, then he will not spawn on that profile. In order to try again, either the player must begin a new New Game Plus or create a new save entirely.


This Unique Monster will be available after completing the quest Ardun Rearing, available by speaking to Pekka in Gormott. Its stages of growth are as follows:


Break 90% Smash 0%
Topple 0% Blowdown 60%
Launch 0% Knockback 60%


Trigger HP has been reduced below 50%.
Effects The enemy recovers 0.0005% HP every 2 seconds.
Damage received from elemental weakness increased by 80%.
Element Light


Art Type Element Hits Range Damage Ratio Reaction Effect
Auto-Attack Physical - 1 One Target 100 - -
Horn Dance Physical - 4 Circle 250 - -
Tank March Physical - 1 Ahead 350 Blowdown -
Poison Breath Ether Water 1 Ahead 300 Stench -


Name Type Rarity Chance of Drop
Rare Core Crystal Core Crystal Rarity2.png 50%
Legendary Core Crystal Core Crystal Rarity3.png 10%
Angrite Chip Core Chip Rarity3.png 9%
Spiral Chip Core Chip Rarity3.png 9%
Winonaite Chip Core Chip Rarity3.png 9%
Damage Heal V Aux Core Rarity3.png 7.2%
Endurance V Aux Core Rarity3.png 7.2%