Repulsion Shield

Source: Essentials from the Outer Planes

Armor, Uncommon

Armor (Shield), Uncommon You gain a +1 bonus to Armor Class while wielding this shield. The shield has 4 charges. While holding it, when a Large or smaller creature within 5 feet of you hits you with a melee attack roll, you can take a Reaction to expend 1 of the shield’s charges and push the attacker up to 15 feet straight away. The shield regains 1d4 expended charges daily at dawn.