OK, to get to the rooms of death (my opinion of any attempt to stop in the rooms to fight - these were ones people ran through for the Casca quest, to be rezzers for people who went through with stealth, as many characters couldn't survive the trip)
1. you go to the Spirituality gate, run through the spider caves, to the teleportal to the island with the ethereal warriors (the GOOD versions of the critters that are invading Moonglow in the current event).
2. Go to the basement, look for the note on the floor, stand on it, and say "masteropenthydoor" as one word.
3. go through the door in the room you arrive in (it's the one we got Ricardo to pick, so many years ago), take the west branch (the east is a deathtrap).
4. up the steps, is a room full of undead (including rotters and ancient liches), that will most likely kill you if you try to stand and fight. there is a password to say to get teleported through the door (and into the middle of the undead. Look for the threads in U.Hall back in the summer, concerning the quests for the 25k Spring Cleaning tickets (in relation to casca). another password is needed to teleport through the door out.
5. The next room is demonkind, and while it doesn't require an entry password, it requires an exit one, and the concentration of demonic spellcasters will make it extremely difficult to survive if you try to stand and fight. The way out (requiring the password) is the north door.
6. The next room is the Repond room, and is potentially the most survivable of the lot, due to their not being casters (a group of cross-healing swordsmen with soul seekers should be able to stand their ground there, if they pump all their mana into non-stop whirlwinds to clear out the initial spawn). Still not easy. East door is way out, requiring a password.
7. room after that is safe way out and can be recalled from.
I know 2 of the passwords are futile and concerto, but the others escape me at the moment.