If I remember correctly from levelling through there a month ago, that person is not Lillian Voss...but it is someone familiar. If there were a spoiler tag on here, I'd even post who it is, but the name is mentioned in this article.

Can someone post the name? I don't recall seeing that person. (Put a spoiler warning on it if you want.)

I think her class would be "Tribute to Jack from Mass Effect 2."

Come on, super-mega-ultra powerful, made powerful as a kid, seeking revenge, not quite right in the head.... What else could she be? :P

Anyone remember the Raven Priests from Northrend? I suspect that some of Mal'Ganis's finaglin with the Crusade that gave them these new powers has to do with the purple flame... if she is to be a class, I'd guess something with demonic magic, so Warlock perhaps?

This to me just seems like Shadow Priest magic--more specifically the new Shadowfrost kind we got in Cataclysm. Except Lilian Voss here can use it in a much more deliciously flexible manner.

I'm pretty sure she's a (at least partial) tribute to Liliana Vess (http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=205961). Their stories are different, but the name is unmistakable, and the powers are similar (in that they're both "evil".)