Weigh the Soul

A quasi-spectral scale appears above the target. The target must roll three saving throws; first intelligence, second wisdom, and finally charisma. For each failed saving throw, the target takes 2d12 radiant damage as they are struck with beams of light. If the target fails all three saving throws, it is knocked prone and stunned as a bolt of divine energy strikes their wanting soul. Roll twice the normal number of damage dice if casting this spell in the Astral Plane. 

You may cast this spell using a 9th-level spell slot. The damage dice become d20s and now when the target fails all three saving throws, its soul is ripped out of its body. The target is effectively dead, as their soul drifts aimlessly in the Astral plane. If the target is physically on the Astral plane, their body is banished to the Material plane while their soul remains in the Astral plane. The duration of this effect is until dispelled, though bringing the body into the Astral plane also ends this effect. If the target's body is destroyed, the soul remains intact for a century; drifting in the Astral plane.