for secondary i think survivability and good damage wise i like Atomic and Mental atomic offers more rech and good regen mental u can cap regen recov just gotta get the right sets for def not sure on dark i just started one so don't know much. have a farming fire/Atom and a Water/Mental, the same thing really for main water and dark would prolly be best best sets water has a small heal and lots of kd mid and aoe's.