You rush forward up to your maximum movement speed in a straight line, reinforcing yourself with metal. This movement stops early if you come in contact with a surface or creature. If you come in contact with a creature, they must succeed on a Strength saving throw or take 3d6 bludgeoning damage and be knocked prone. On a successful save, a creature takes half as much damage and is not knocked prone.   Ironclad. If you are wearing metal armor, the damage becomes 3d10, and you can choose to push back the target up to 15 feet in a straight line instead of knocking them prone.   At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the distance you move increases by 10 feet for each spell slot above the 2nd, and the damage increases by 1d6 (or 1d10) for each slot level above 2nd.