Sustain

As a last ditch effort to survive, your mind fires out a spherical barrier of energy around you. Until the start of your next turn, you are immune to all damage and conditions, except the ones caused by this spell. This barrier prevents any matter from passing through it and blocks any spells cast into it. The barrier extends into the Ethereal Plane, blocking ethereal travel as well. For the spell's duration, you are incapacitated, can't move or speak, and are unaware of your surroundings. When the spell ends, you are no longer incapacitated, you awaken with 1 hit point, and gain a point of exhaustion.