pf2e.fyi
From Pathfinder Impossible Magic, which isn't enabled.

Coward's Shield

ITEM 6
Price 225 gp
Bulk 1
AC Bonus +2
Hardness 6
HP 36
BT 18

This eerie, blackened steel shield (Hardness 6, HP 36, BT 18) seems to actively reject light that touches it. You gain a +1 circumstance bonus to Stealth checks to Hide while this shield is raised.

Activate—Shadow Slip (concentrate)
Frequency once per day
Trigger You would take damage while this shield is raised

Effect Shadows swallow you. You become Concealed until the end of your next turn.
Pathfinder Impossible MagicORC