From a bug report,
when climbing out of Gehennom while carrying the Amulet, you could skip
a handful of levels by taking the magic portal into the Wizard's Tower,
dropping the Amulet, zapping it with a wand of teleportation--possibly
more than once--until it lands outside the tower. Then take the portal
back out of the tower and level teleport--feasible now that you're not
carrying the Amulet any more--back to the tower level and retrieve the
Amulet. Overall probably not much of a savings unless you're having
really bad luck with the mysterious force sending you back whenever you
try to go up. The hero and monsters can't teleport from inside the tower
to the outside or vice versa; this gives the same limitation to objects.
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