Every Last Drop

The caster creates a ritual circle that is 10ft in diameter. The caster writes the abyssal incantation Rqxxw Xcjqiwx Wxudt  (Bleed Explode Death) around the circle. This takes one turn.

At the start of the casters next turn they cut their wrists and lie within the circle. The caster enters a trance state and is in that state until the end of their next turn. The caster cannot move and cannot leave the trance until the spell is complete. The caster is immune to charmed and psychic damage. The caster also resists all damage except piercing. 

Once the spell is cast all of the casters blood shoots from their body. The blood hardens as it leaves creating needles. All creatures wishing 100ft take a number of d10 two times the casters hit die of piercing damage. Creatures that are not constructs or undead must make constitution saving throws. On a failed throw damage they take is necrotic damage and the are poisoned.

Following the spell, the caster immediately enters a death save state. If the caster passes the death save they remain unconscious for at least 15 minutes, during which time they are only effected by maiming attacks. Upon waking they will have 3 points of exhaustion, no spells slots, and disadvantage on all ability checks until they complete a long rest or are healed by a level 5 healing spell or higher.