[DkySven]

You should not make certain classes good in one realm, but to make a class different in a different realm. Like Alsius warlocks more ice damage spells, Syrtis spells "to put the dead guys to rest", counter spells for Necromancy and Ignis.. I have to think something for that.
For warriors, Alsius makes the best armor, Syrtis warriors are good with swords, and Ignis warriors give everything in a fight, maybe less protection and more damage for barbarians or something like that. Hunters; Syrtis' ones are very good with bows, Igneans are good with pets and Alsirians good in scouting. And so on.