I 2 boxed her with a 60 monk and 57 shammy. She cant be slowed, snared, rooted ...nada. It really doesnt matter..with a 430pt heal i was able to take her down...easily. All that that I did was basically put 2 Bane of Knife's on her and kept a little distance and my monk in her face. She procs/casts a slow so melee damage was slow, but it didnt matter, she doesnt have many hp's, as long as you have a procing wep to keep her agroed on the melee...you'l be fine. She also cast a cold based DoT, or DD with a little DoT component, but its weak..cold resist was 80+ and I resisted all but 1.She has several (4) water elemental guards around her and usually 3 other protectors/temptresses also. Key is to get her alone, agro pull is best, since they all have a large agro range...and easily done with a monk with any skill at all. There is a ledge around her room where you can pull her out of the water and kick her kaboos, she does run at the end so if ya got a nuker, have them nuke at 20% if you dont want the extra agro.
You can invis past most mobs on the way to her room, temptresses see invis tho, best thing to do is get your group around the entrance of the cave, invis a FD puller, and send him/her in for a looksy, if there are no tempresses on the way there, invis up, get to her room and immediately take a right or left and head outta the water and on the ledge and away from the entrance. If there are see invis mobs, get ready for a train....but they are easily killed, so no real worries.
LvL for effect is 50. My guild on VZ camps this mob all the time, and she is tuff. Underwater mob that summons, nukes, quad hits for over 150, and cast some wicked spells. Oh and the real hard part is the fact that she seems immune to magic attacks, so casters can hardly hit her, she cant be slowed.