I kept thinking "the trick must be to figure out how to read the Scroll of Omnipotence on the Chaos Plane" but that had seemed 100% impossible with the stairs reversed. The first part of this is test-able without doing all of the steps to get the scroll. You need a character who can enter the Quickling Tree to first win the game, then USE the tree on purpose to let 6000 years pass in game time (likely multiple enter-and-exits of the tree for food supply), and check on....I think the direction of the stairs on D:48?