Endless Abyss

You attempt to separate a creatures soul from their body, and cast it through the endless ravages of the void. Make a touch spell attack. On a hit, the target's soul is ejected and cast into the void, taking force damage equal to 1d10 per your current number of void dice. Whilst separated, the creature acts normally and suffers none of the damage it's soul takes whilst it is in the void.

As a free action on each of your subsequent turns, you can increase and use your void dice by 1, applying an additional 1d10 force damage per your new dice amount.

At the end of each of the creature's turns, it can attempt to make a Charisma Saving Throw to reverse the duality. On a success, the soul returns to its body, and the spell ends.

If the spell ends for any reason, all accumulated damage is taken by the creature. If this damage would reduces the creature to 0hp, the soul is immediately claimed by the caster and stored in the vessel used in the casting of the spell. If the spells full duration concludes, the total damage dealt to the target is doubled.