Treasures - Breastplate of Diomedes

This +5 breastplate is embossed with a charging boar and was forged out of solid gold by Hephasteus himself.  Additionally, any armor check penalties are reduced by 2 and the armor provides the wearer with limited protection from critical hits.  Critical hits only occur on the roll of a natural 20, regardless of threat range or feats, and even if confirmed, there is a 50% chance that it is reduced to normal damage