Soul Sucker

You've done it. After years of research and/or training, after traversing through many realms, after consulting many a lich and other monsters, after being blessed by a divine deity, or simply after stumbling upon a forgotten magic, you've finally done it: you've mastered the ancient ability of soul-sucking, granting you the following benefit:

• As an action, you can try to suck the soul out of a living creature. Choose a target within 30 feet of you that has less than 100 current hit points. That target must make your choice of either a Constitution, Intelligence, Wisdom, or Charisma saving throw against your contesting roll of the same ability score you chose plus the corresponding modifier. On a failed save, the creature you targeted has their soul sucked out of them and controlled by you, and their now soulless body falls prone and unconscious and remains that way unless it is re-inhabited by a soul or animated. A creature can willingly fail this saving throw. The soul of the creature you chose is aware that it is now outside of its body and retains its personality and ability scores, however, it cannot move around freely unless by your will (as a bonus action, you can move the creature's soul up to 30 feet as long as it stays within 300 feet of you), and the soul can pass through any non-magical substance. Every hour, the creature's soul can choose to repeat the saving throw, and on a successful save the creature's soul re-inhabits its body, assuming its body hasn't been destroyed. The DM determines the appearance of the creature's soul unless the soul is from a player character, in which case the character's player decides the appearance. As an action, you can choose one of the following options:

1. You force the creature's soul to make another saving throw. On a failed save, you devour the creature's soul, gaining temporary hit points equal to 2 times your level. Once devoured, the creature's soul becomes nonexistent.
2. You force the creature's soul to make another saving throw. On a failed save, the soul explodes, and all creatures within a 15 foot radius of the explosion take 3d10 force damage and are pushed 5 feet outward from the explosion and fall prone on a failed DC 13 Dexterity saving throw. Once exploded, the creature's soul becomes nonexistent.

You can try to suck out a creature's soul once every long rest, and when you successfully do so and choose one of the options above, you suffer one level of exhaustion.