Boxing with a 105 Ranger and Mage with 2x Cleric Mercs, I'd wiped about 5 times just trying to break into the room. This morning I finally had success.
Using an eye, harmony the room. Then stand right outside the door and let 2 of the 6 mobs proximity agro you (Probably didn't need the harmony). Pull these into the hall and kill. Rinse and repeat.
Spawn times are about 10 minutes, so if you can space the kills out a hair, it will be much easier for you.
It took about 5 clearings before The Fallen Noble spawned. She is a little harder than the normal trash, but not all that hard of a kill.
Really late posting, but since this mob is going to be up again next month, thought I'd mention a few things:
1. If you are actively camping this mob, expect to be really popular in all the wrong ways while you do it. She likes to do some rampaging, across the zone. 2. If you wipe, the entire zone is probably next! This comes as a consequence to her rampaging and probably taking DS damage from whoever she does this to. 3. Full room spawn with her up in it, you are going to have problems.... It is so packed there that effectively splitting it all up is just, not happening really. What I had to do was just agro the entire room on a deflection tank, then group mezz everything but her. Take an enchanter to beat an enchanter, basically. 4. I forget what effects she has, but she has some real nasty ones not listed here. I think one was a fear or charm type, in fact. Not at all a straight melee fight, everyone huddled in a corner with run off is a pretty good idea, really... I know I had to have a healer merc in addition to my clr box so we always had some sort of healing happening even with her effects.
Best of luck to all on this one, it really can be that bad!
Room aggro is disgustingly sensitive and mostly end up entire room on a single pull. (no room to fade either) Can't break a room without right classes. I gave up some point, hard boxing and few mercs.
First five times I killed her, she spawned wearing a dark robe -- and each time she dropped the Noble's Robes. Next three times I killed her, she spawned naked each time -- and each time she dropped the augment.