Bone Cocoon

You conjure up a cocoon made of cartilage and bones, which protects a creature of your choice. While in the cocoon, the creature can’t be damaged by attacks or effects originating from outside, has total cover, is considered restrained, and makes death saving throws at advantage.

The cocoon has 25 hit points, an AC of 11 + your Spellcasting modifier. It has resistance to cold, fire and necrotic damage, and immunity to poison and psychic damage. If you lose concentration or the cocoon is brought to 0 hit points, it is destroyed