You can almost always design a build to defeat a certain enemy. The thing is you want a build that is effective against most types of enemies, not just one. If you can't kill a dervish by yourself, get some help from your team.
nah this is just my friend and were doing a friendly battle agianst esch other and i was looking for some tips for a 1 on 1 fight (specifically what skills?) thanks agin :P