Before setting information for Numenhalla, a note. Per Goals in the Megadungeon, you cannot clear out the mega-dungeon. Let me repeat that and be clear:
YOU CANNOT CLEAR OUT THE MEGA-DUNGEON.
It is simply too big, by the time you hack far enough in a single direction (which keeps on going) the place where you started will have filled back up. Combat is not the goal - the goal is to acquire treasure and uncover mystery.
But you can win the Mega-Dungeon, but you'll have to figure out how.
Also: Do not get too attached to your characters at first - there's a reason we're using a system where you can roll up a character in 3 minutes.