Osteophagia

Steinhardt's Guide to the Eldritch Hunt

Osteophagia

9-level Conjuration

Casting Time: 1 action

Range/Area: Touch

Components: V, S

Duration: Instantaneous

The most lethal osteomantic power. You can cause the skeleton of a creature to liquefy in a matter of seconds, causing the body to collapse in on itself. Choose a creature within your reach; it must succeed on a Constitution saving throw or die.
A successful save prevents the death by skeletal collapse, but the creature still takes 10d6 necrotic damage. Creatures without bones and creatures whose CR or character level is equal to or higher than the caster’s CR or character level are immune to this spell.

Available for: Warlock, Wizard