I've not really had any problems to 30 so far. Been working more lately so been slowing down on lvling. So umm is "dopple" a term for pulling with a crossbow or something? And AT, that's the place you do the PB quest? Sorry for all the questions in your thread Vanilla.
"Dopple" isn't anything, although that's not your fault. Technically it would be "doppel" if they were to shorten it. Anyway, doppel's just a weak mirror image of your rogue--it's pretty much useless at end-game, because its highest level is around 57-58 if my memory serves correctly, and attacks with a 2.0 speed no matter what you're buffed with. It can be useful for pulling things at times, but even then it's best to leave it one or none.
The Possession Beast quest chain starts at the mayor of Zakate; it will send you through areas of Turba and Parness, and will end at the Ruins of Lament.