From Pathfinder Impossible Magic, which isn't enabled.

Rebounding Breastplate

ITEM 20

FORCE MAGICAL

Price 70000 gp

Bulk 2

Category medium

Group plate

AC Bonus +4

Dex Cap +1

Strength +3

Check Penalty −2

Speed Penalty −5 ft.

This +3 greater resilient greater fortification breastplate absorbs impacts for later release. While wearing the armor, you gain resistance 5 to bludgeoning, piercing, and slashing damage and resistance 10 to force damage. Keep track of how much damage the armor prevents from enemy attacks, as the armor absorbs that damage. After 1 minute, the absorbed damage disperses harmlessly and resets to 0. Only damage caused by foes or hazards powers the armor, not damage you take from yourself, allies, or the environment.

Activate—Kinetic Pulse (force, manipulate)

Requirements Your armor has absorbed at least 30 damage

Effect The absorbed energy explodes from your armor in a pulse of force. Creatures in a 30-foot emanation take 12d6 force damage with a DC 43 basic Fortitude save. On a failure, they're also pushed 10 feet away from you; on a critical failure, they're instead pushed 20 feet away from you and fall Prone. The armor's absorbed damage resets to 0.

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