You have a +3 bonus to AC while wearing this armor. The breastplate has a mimic like a mouth in the middle of it and when a player kills a being the mouth eats the soul of the person it adds a +1. each soul eaten adds a vulnerability to a variety of damages.:

This armor consists of a fitted metal chest piece worn with supple leather. Although it leaves the legs and arms relatively unprotected, this armor provides good protection for the wearer's vital organs while leaving the wearer relatively unencumbered.