Warhammer of Repelling Force

You gain a +1 bonus to attack and damage rolls made with this magic weapon. The warhammer has 6 charges and regains all charges after a long rest or 2 charges per short rest.
When you hit a target no more than one size larger than you with the warhammer, you can expend 1 or more charges as part of the attack. When you do, the target must make a DC 15 Strength saving throw. On a failed save, a creature is launched 10 feet away from you for each expended charge. 
If the target hits a solid object by being launched in this way, it takes 1d6 bludgeoning damage per charge. If the solid object is a creature, that creature takes the same amount of bludgeoning damage from the impact as the target of the attack.

Item type

Weapon, Melee