Adds +2 to AC and the first Ray effect that targets the wearer automatically misses and does not affect the wielder of this shield. The Ray-negating effect is usable once per room, but the AC-enhancing effect is constant.
This shield is effective against rays that deal Eldritch damage because this shield effectively turns the ray’s attack from a hit to a miss. This shield doesn’t technically negate the Eldritch damage–nothing can do that–it just causes the attack to miss.