Blood to Glass

The blood of a creature you can see within range begins to fuse into jagged shards. The target must make a Constitution saving throw. It takes 10d6 slashing damage on a failed save, or half as much damage on a successful one. On a failed save, the target also continues to take slashing damage for the spell’s duration as its blood fuses together and slices the target from within. At the end of each of its turns, the target repeats the saving throw. It takes 5d6 slashing damage on a failed save, and the spell ends on a successful one. 

A creature killed by this spell will be brittle and shatter easily.