"Bigger Ben". To get down it, you have to find the hidden portals and then go through another long "Lobby" map.
Giant purple Nependeath-type-things. Quite weak.
The famous Fire Tusk from the concept art. I have to say, their firebreathing effect is quite cool-looking.
"Killa Bees". They spawn like nuts in the second map of the area. Have between 600 and 1k HP, I think.
Wolf Spiders, the highest-level monster I saw. They did 1700 damage to someone below me, so I just stood on the portal. (Didn't feel like wasting pots with MG.) That hermit was sniping them easily.
Town return scrolls don't work there. =O
I think these NPCs have something to do with the boss.
Another one. The Fire Chamber map above has Jr. Effies, while this one has Jr. Yetis.
I think this is the boss room.
You have to jump up an invisible staircase to get out through the Killa Bee map. I totally wouldn't have guessed unless I saw someone else do it. (I got incredibly lost after I went to the boss room.) The top portal goes to Wolf Spiders, the bottom to the various Chambers.