Walking Bomb

The caster magically infects a target within sight with a corrosive poison. The target makes CON save vs your spell save. On a failed save the target takes 2d6 acid damage per round, and if the target dies while under the effects of the spell, they explode, dealing 8d6 acid damage to all creatures within 20 feet of the target. On a successful save they take no damage and are not infected.