Ghosts/Malachite is a Watch floor where on the other side of the elevator are either Ghosts or Malachite. Malachite is a character that is from the cartoon show 'Steven Universe'. If the floor number is less than 1337, ghosts will always spawn. If greater than 1337, malachite will always spawn.
Fun Fact: After floor 6666, there is a 1 in 6 chance of Malachite performing a dramatic action.