Verac's plateskirt

Verac's plateskirt is melee armour worn in the legwear slot that is part of Verac's armor set of barrows equipment. To wear Verac's plateskirt, a player must have 70 Defence. Being part of Verac's armor set, if Verac's plateskirt is worn along with all of the other pieces of equipment in Verac's armor set the player receives a Set Effect. Successful attacks have a chance of hitting through an opponent's defence and prayer, potentially causing heavy damage. This piece of armour cannot be made using the Smithing skill.

This set from the barrows brothers is the only one of which any/all pieces contain prayer bonuses. So if players do not mind mixing up between Barrows armour (just getting them for their high defence), then Verac's helm, platebody and plateskirt have the equal-highest defence of the 4 brothers' armour as well as the a prayer bonus.