Bone Cocoon

You conjure a cocoon made of cartilage and bones, which protects the creature that dropped to 0 hit points. 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 and an AC of 11 + your spellcasting ability 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 reduced to 0 hit points, it is destroyed.

Steinhardt's Guide to the Eldritch Hunt 190

V, M

Material Components

a shrunk and gilded rib cage worth at least 5* gp

Related Discipline

Druid, Sorcerer, Tamer, Warlock, Wizard

Related School

Abjuration [Osteomancy]

Effect Duration

Concentration, Up to 1 Minute

Effect Casting Time

Reaction, which you take when you see a creature drop to 0 hit points

Range

30 feet

Level

Level 2