From Pathfinder Adventure Path: Hellbreakers, which isn't enabled.

Martyr's Shield (Hellbreakers)

ITEM 7

UNCOMMON

Price 360 gp

Bulk 1

AC Bonus +2

Hardness 8

HP 64

BT 32

This silvery minor reinforcing steel shield bears the image of two soldiers standing side-by-side.

Activate—Self Sacrifice (manipulate)

Frequency once per minute

Trigger An ally within 20 feet of you would take physical damage

Requirements The martyr's shield is raised

Effect When you activate this shield, it magically imposes itself in front of the triggering ally and takes the damage for them with the effects of Shield Block. Any damage that isn't prevented by the shield is transferred onto you.

Hardness	HP	BT
8	64	32

Pathfinder Adventure Path: HellbreakersORC