Bull Rush
If you move at least 10 feet in a straight line toward a target immediately before hitting it with a melee attack roll, you can expend one Battle Die as a Bonus Action to perform a Bull Rush. The target takes extra Bludgeoning damage equal to the roll of the Battle Die, and must succeed on a Strength saving throw or be pushed 10 feet away from you and have the Prone condition.
Sources
Valda’s Spire of Secrets Extras (2024)