question about the game....

I was reading the forums and a guy mentioned that he finished Prophecies with a Dervish. How do you play a Nightfall or Factions class in Prophecies or a chapter that doesn't have them as a class?

at one point in nightfall you can travel to other countries

http://gw.gamewikis.org/wiki/Terror_in_Tyria
http://gw.gamewikis.org/wiki/Plague_in_Cantha

The only place you can create a dervish is NF, but you can travel with him to cantha and tyria, thus the legendary guardian title (all mission + bonus in HM and NM).

thanks folks. The question was serious. I've been a member since 2006, but I've only played GW a few times and have recently gotten into it (NF). Thank-you for answering my question,
cheers!