Crelia's Cryonic Constitution

This spell turns the flesh of a willing creature you touch to ice. Until the spell ends, the target has resistance to nonmagical piercing, and slashing damage, and becomes vulnerable to bludgeoning damage.  If the target is struck with a melee weapon or unarmed attack, the attacker must succeed a Constitution saving throw equal to the caster's spell save DC or be frozen until the end of their next turn.  Frozen creatures are incapacitated and are vulnerable to bludgeoning damage.