From the newsgroup: prevent monsters from level teleporting out of
the quest into the main dungeon. The player can't do that and monsters
weren't supposed to be able to, but from time to time the quest nemesis
has seemingly vanished after reading a cursed scroll of teleportation.
His disappearance was due to ending up on a random level between the
quest entrance and the top of the dungeon.
This also fixes an obscure bug that I noticed while trying to
reproduce that problem: uncontrolled level teleports by the player in
the quest had 80% or thereabouts chance of ending up on the quest home
level. All 12-15 main dungeon levels above quest entrance were included
in the random range of 1 thru current+3, then any choice which tried to
pick one of those was converted to quest level 1. (Monster destination
wasn't getting that adjustment.)
bc2215268b