I am a Fury and have a merc. I've cleared everything in the whole zone, to my knowledge, with the exception of Eom'Tek'Zen. I've gone at her 3 times, and 3 times she has reset with her Servitors. I did do this over a period of two days, so maybe it's because I logged out and back in. I'll try it all again when the zone resets and play through to the end in the hopes that it was just buggy because I'd logged out and back. I had noticed that the artifact radiates various colors, so I was starting to think that there was a puzzle that needed to be solved in order to kill her.