Transmute Blood to Acid

You begin to change the lifeblood of one creature you can see within range into a vitriolic green acid.

The target is wracked with unimaginable pain, and is stunned. The target's flesh begins to dissolve, inflicting vulnerability to bludgeoning, piercing, and slashing damage for the duration.

The target immediately takes 10d10 acid damage when this spell is cast, and again at the beginning of each of your turns while you maintain concentration.

A creature under the effects of this spell must succeed on a Constitution saving throw or take 10d10 acid damage at the start of each of its turns. On a successful save this damage is reduced by half, and one harmful effect is removed from the creature. This save can then be repeated each time the target takes damage from this spell.

On the first successful save, the target is no longer stunned. On the second successful save, the target is no longer vulnerable to bludgeoning, piercing, and slashing damage. On a third successful save, the spell ends.

A creature reduced to 0 hit points by this spell is killed instantly, as its body reduces to a thick gray sludge.

This spell has no effect on creatures without blood, such as constructs and elementals.