This shield is emblazoned with the double-diamond emblem of the ogre king.
Normally, it acts as an ordinary small shield. Against humans, elves, dwarves, gnomes and halflings, however, it becomes a +1 shield, and has two additional powers:
1) Any attempt to break the shield or disarm you of it are made with disadvantage.
2) When an enemy rolls a 1 on a ranged attack, the missile rebounds on the attacker. The attack roll is made using your ranged attack bonus, with proficiency.
1) Any sunder or disarm attempts against the wielder are made with a -4 penalty.
2) When an enemy rolls a 1 on a ranged attack, the missile rebounds on the attacker. An attack roll is made as if the wielder of the shield had fired or thrown the missile.
Whenever held, the shield glows. The glow is too faint to be seen in lighted areas.
The 2nd edition version is the first D&D magic item I ever created. :)