wall of ice and fire

You create a wall of ice covered in flames on a solid surface within range. You can form it into a dome or a sphere with a radius of up to 10 feet, or you can shape a flat surface made up of ten 10-foot-square panels. Each panel must be be in contact with another panel. In any form, the ice is 1 foot thick.

When the wall appears, each creature within its area must make a Dexterity saving throw. On a failed save, a creature takes 5d8 fire damage and 10d6 cold damage, or half as much damage on a successful save.

The wall is an object that can be damaged and destroyed. It has 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 frigid air in the space the wall occupied. A creature moving through the frigid air for the first time on a turn must make a Constitution saving throw. The creature takes 5d6 cold damage on a failed save, or half as much damage on a successful one.

when the wall is attacked, the attacking creature takes 5d6 fire damage.