Harbinger Ritual

Casting Time: 2 hours
Range: 30 feet
Components: V, S, M (a shard of cracked obsidian placed within an inscribed circle)
Duration: Instantaneous

You forcibly sever a lingering soul from its earthly tether. Choose one undead or restless spirit within range; it must make a Charisma saving throw. On a failure, the spirit is expelled beyond the veil and may not return to the Material Plane by any means short of divine intervention.