Enchanter->Coercer Hallmark quest at level 15?Follow

Anyone tried doing this? :(
I get to the Gul'Thex Citadel, and can't really find out where I turned wrong, since there is no way past the citadel.. Except maybe from inside it? But with mobs twice my level, I'm not gonna risk enter it.. (Again.). Anyone know what to do (Am searching for Timber Falls)?

Timber Falls, can be reached by following the Torrent(?) River (the river you zone in over) all the way north to its source.

Is this Hallmark quest, the quest that gets you your 'evil only' sub-class? (I.e. Coercer, ShadoKnight, Necro, etc) I received a hallmark quest when I first zoned into Nektulos 'Calling of the Forrest', I think I am almost done. I am supposed to go hunt down Gul'Thex Sentries I think. I am working on the part where I need to kill these undead to obtain their sight, so that I can read the ancient writing in nektropos or something.