*3rd degree Arcane Knight action* With a call of power and a mighty swing you strike the ground between your feet and unleash a powerful burst of energy that rips forward through stone and sand. When you use this ability choose an adjacent square. When you strike this square a 50ft long, 5ft wide, line of difficult terrain. Striking a surface that is 3ft thick or less, such as a rooftop or an ice-bridge, shatters the surface along the line. Creatures within the line take basic melee bludgeoning damage. If the surface they’re standing on is destroyed, they must make a Dexterity save or fall. On a successful save, they can reposition 5ft to the left or right.