Combat Slide

After moving at least 10 ft in a straight line, you can perform a combat slide, sliding between 10 and 15 ft (still in a straight line) without provoking attacks of opportunity. This cost movement as usual.  You are allowed to move through enemy and ally squares (does not count as difficult terrain). You must end your movement in a free square. If you slide through an opponent's space, you can choose to make a melee attack during the slide with advantage. If you have a weapon with the Topple weapon mastery, the enemy has disadvantage on the saving throw to avoid being knocked prone.