Deep Purifier's Ice Comet

A icy comet falls down on a point you can see within range. Each creature in an 80-foot Sphere centered on the point the comet hits must succeed on a Constitution saving throw, taking 25d6 Bludgeoning damage plus 25d6 Cold damage on a failed save, or half as much on a successful one. If a creature is reduced to 0 Hit Points by this spell, it freezes and shatters into pieces. (Twinned spell Metamagic cannot affect this spell.)