The Reaper of the Chaos Planes is a servant of Grenth who governs the Chaos Planes of the Underworld. He can be found by Grenth's Statue in the Chaos Planes. He can teleport the party to the other Reapers of the Underworld, as soon as they have been freed (see quest Restoring Grenth's Monuments). Take care not to let any monsters come near the Reaper. If he dies, your party will be kicked out of the Underworld.