Wall of Ice

You create a wall of ice on a solid surface. You can form it into a hemispherical dome or a sphere, either with a radius of up to 10 feet. You may also choose to create a flat surface made up of a contiguous group of ten 10-foot square sections. The wall is 1 foot thick. If the wall enters a creature's space when it appears, the creature is pushed to one side of it (your choice). In addition, the creature makes a Dexterity saving throw, taking 10d6 cold damage on a failed save, or half as much damage on a success. The wall is an object with vulnerability to fire damage, with AC 12 and 30 hit points per 10-foot section. Reducing a 10-foot section of wall to 0 hit points destroys it and leaves behind a sheet of frigid air in the space the section occupied. A creature moving through the sheet of frigid air for the first time on a turn makes a Constitution saving throw, taking 5d6 cold damage on a failed save, or half as much damage on a successful one.