We play in x7 server. Overlord is only for orcs (need to pick orc mystic at start). Good thing is that orcs can sub all other races, for example dark elf cant sub normal elf since they are in kinda of a war. The big lack of overlords are due that noone can sub a overlord, its only for orcs. Same as warsmith is for dwarfs. And yes, overlord is best duffer and has ally CP heal and ally buffs.
Well here are the links to classes and subclass.
We have fourms but i think posting links to other forums werent allowed also so ill pm u. U can also try to pm ingame. "name text, I should have spoofy on most of the time