Promession [two-actions] Spell 6

You flash freeze a target then send subsonic waves through it, potentially reducing it into fine powder. Make a spell attack against the target. If you hit a target, the target takes 6d8 cold damage and must attempt a Fortitude save. If you critically hit, the target gets a result one degree of success worse than it rolled on its Fortitude save. A creature reduced to 0 Hit Points is blasted to fine powder; its gear remains.