The Reaper Ship is a derelict vessel roaming the waterways of the Aquvy archipelago. The ship was taken over and infested by Wels, or "Reapers" as they are known to the people of Aquvy and they used it as a base to terrorize the people of Aquvy from. One of Billy's missions from the Ethos HQ was to clear out the Wels from the ship, which he accomplishes with the help of Fei, Bart, Elly and the others.