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From Pathfinder #180: The Smoking Gun, which isn't enabled.

Self Destruct

FEAT 12
ARCHETYPE
Activity reaction
Archetype Clockwork Reanimator
Prerequisites Clockwork Reanimator Dedication
Trigger Your reanimated clockwork companion is reduced to 0 Hit Points.
Requirements You're within 60 feet of your reanimated clockwork companion.

You've installed a self-destruct device within your construct companion, which you can trigger with a special device from up to 60 feet away. When you activate the device, your reanimated construct companion explodes, dealing 2d6 fire damage per level ((2 × your level)d6 fire) to all creatures in a 30-foot radius. Creatures caught in the blast can attempt a Reflex save, with a DC equal to the higher of your class DC or spell DC.

Pathfinder #180: The Smoking GunOGL