Crushing Sphere

When you cast this spell you become surrounded by a large sphere of ice that encases you within, and is impervious to outside effects. It rolls along the ground in a line 40 feet long and 10 feet wide in a direction you choose. Other creatures in the line must make a Dexterity saving throw. A creature takes 2d6 bludgeoning damage and 2d8 cold damage on a failed save, or half as much on a successful save. The sphere then dissapears, and you appear in an unoccupied space of your choice within 5 feet of the end of the line.

At Higher Levels: When you cast this spell using a slot of 4th-level or higher, the length of the line increases by 40 feet per slot level above 3rd.