Turn to Glass

You touch a creature. Until the spell ends, the target's bodily material is entirely replaced with glass. The target's AC becomes 10 - the target's Strength modifier and as the target is damaged, sharp edges in its surface grant it a bonus of half the difference between its current HP and max HP rounded down on unarmed strikes. The target is entirely transparent for the duration of the spell, allowing for any creature to see through it.

The spell immediately ends if the shard of glass used to cast it is shattered.