From Pathfinder Battlecry!, which isn't enabled.

Reactive Mail

ITEM 5

FLEXIBLE INVESTED MAGICAL NOISY

Price 160 gp

Bulk 2

Category medium

Group chain

AC Bonus +4

Dex Cap +1

Strength +3

Check Penalty −2

Speed Penalty −5 ft.

Often heavily battle scared from use, this chain mail is commonly issued to frontline soldiers who are tasked with battling through enemies to reach high-value targets across the battlefield.

Activate–Quick Spike (manipulate, metal)

Frequency once per hour

Trigger A creature within 15 feet uses a manipulate action

Effect An iron spike launches from your armor at the target, dealing 2d8 piercing damage to the target (DC 20 basic Reflex save). If the target critically fails, the triggering action is disrupted.

Pathfinder Battlecry!ORC