Desolate Winter

You raise your hands, holding the components as you bring them together. A wave of extreme cold creeps over the land from a point within the spell's range that you choose, spreading up to a 120 ft radius from that point. All creatures within the spell's area must make a Constitution saving throw. On a failed save, a creature takes 16d8 cold damage and is petrified for the spell's duration, becoming encased in ice. On a successful save, a creature only takes half damage and isn't petrified. The ice encasing each petrified creature has an AC of 12, and 27 hit points. It is vulnerable to fire and thunder damage, immune to poison, psychic and necrotic damage, and resistant to slashing and lightning damage.