Trigger The ash skeleton is critically hit
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Effect The ash skeleton crumbles to ash, and the attack deals only normal damage

Crumble

Void Healing

The ash skeleton crumbles to ash or reforms in a standing position. While ash, the ash skeleton is <a href="/condition/immobilized">Immobile</a>, <a href="/condition/off-guard">Off Guard</a>, and has an automatic result of 26 on Deception checks and DCs to pass as an inanimate pile of ash or layer of soot.
The ash skeleton can remain in this ash form indefinitely.

Ash Form

Rend

Ash Skeleton (1-2) - evil, mindless, skeleton, undead, unholy

Trigger The ash skeleton is critically hit
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Effect The ash skeleton crumbles to ash, and the attack deals only normal damage

@Localize[PF2E.NPC.Abilities.Glossary.NegativeHealing]

The ash skeleton crumbles to ash or reforms in a standing position. While ash, the ash skeleton is @UUID[Compendium.pf2e.conditionitems.Item.Immobilized]{Immobile}, @UUID[Compendium.pf2e.conditionitems.Item.Off-Guard], and has an automatic result of 26 on Deception checks and DCs to pass as an inanimate pile of ash or layer of soot.
The ash skeleton can remain in this ash form indefinitely.