The borg was not using Wand of Stinking Cloud while in munchkin mode.
Also, in munchkin mode, he might ‘test/try’ new spells in Trump Realm which would take him off the stairs. This was fatal since he was often clevel 7 at depth 8.
The zborg has always been able to move to the next town to take advantage of the special shops. He would generally not switch towns until he was clevel 5. I moved it to level 10 since he is sometimes encumbered and ravens can kill him since they are so fast. Waiting until clevel 10 is not to0 bad especially since he is in munchkin mode until that level anyway.
Sometimes in munchkin mode he might crush some items at depth 5 when he ought to be selling them.
Borg will continue with munchkin mode until clevel 12.
When the borg dies, he has a set of minimal stats used for rerolling the next borg. Those stats were a little too high and the borg would not reach them in 750k attempts. They were adjusted downward slightly to make them more attainable.