Twinblast

You fling a blast of fire and a blast of ice at a creature or an object within range. Make a ranged spell attack against the target. On a hit, the target takes 1d4 Fire and 1d4 Cold damage. When this spell hits an object that isn't being worn, if the Fire damage exceeded the Cold Damage, the object's temperature increases, if the opposite happens; it's temperature decreases.

Cantrip Upgrade. The damage increases when you reach levels 5 (1d8 Fire + 1d8 Cold), 11 (2d4 Fire + 2d4 Cold), and 17 (2d8 Fire + 2d8 Cold).