Avalanche hammer

You summon a huge hammer to your hand. The hammer has a core where magic energy seems to be wildly pulsing. While holding this huge hammer, which deals 2d10 bludgeoning damage on a hit, you may use an action to strike the ground in front of you and release deadly shock waves. Each creature within 60 feet cone in front of you must succeed on a Dexterity saving throw against your spell DC or take 1d10 thunder damage and fall prone if they are Large or smaller. In addition, all Large or smaller creatures hit with this weapon must succeed on a DC 17 Strength saving throw or fall prone.

Duration: 3 attacks or up to 1 minute.