The Warhammer of Grognak is a melee Legendary Weapon. It fires a beam projectile that does not pierce on use. Right clicking will cause the player to jump high into the air and spin with the hammer. Upon hitting the ground after the spinning stops, a large shockwave that travels along the ground will be shot forward. This shockwave initially deals 10 times damage but it shrinks in size and power over distance; it can pierce infinitely. When the shockwave attack is used while upside-down (as a result of a Gravitation Potion), orb projectiles will fall from the ceiling instead; they can only pierce twice.