Mysterious force


 * A mysterious force momentarily surrounds you...

The much-maligned mysterious force is a random level teleportation effect that occurs one quarter when trying to climb stairs in Gehennom with the Amulet of Yendor. Lawful characters are dumped randomly one to three levels below their current location; for neutral players this occurs half the time, with the other half teleporting them somewhere on the current level; and for chaotic players they are simply teleported around the current level.

There is another mysterious force which is cited as the reason that one cannot teleport on a no-teleport level.