Dissolve Innards

You touch a creature, attempting to destroy their innards by converting it all to potent acid. The spell fails if the target creature is a construct, elemental, plant, undead, or is immune to acid damage. The target creature must make a Constitution saving throw. On a failed save, the creature begins to immediately begins to die, taking 6d10 acid damage and becoming incapacitated. At the end of each of the creature's turns, the creature takes an additional 4d10 acid damage. This spell continues to damage and incapacitate the creature until they are reduced to 0 hit points or the caster dispels it. If the creature receives any magical healing, or have greater restoration cast on them, this spell immediately ends.

On a successful save, a creature only takes the initial 6d10 acid damage and then the spell ends.