Dwarven Bane (5e Equipment)

Weapon (any axe), very rare (requires attunement)

You gain a +2 bonus to attack and damage rolls made with this magic weapon. This weapon scores a critical hit on a roll of 19 or 20. When you hit with a melee attack using this weapon, it deals an extra 1d8 damage or, if the target is a giant, 2d8 damage.