Feat: Bone Burst

Trigger A creature adjacent to one of your thralls uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action it's using, and you are within 30 feet of the thrall.

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You destroy the thrall in an explosion of bone shards that fly toward the triggering creature, dealing 2d10 piercing damage with a Basic Reflex save against your spell DC.

The damage increases to 3d10 at 12th and to 4d10 at 18th level.