A1: Well they automatically have that regen effect so you at least have to be hitting stronger then its healing....i use rangers bc they can get purple gems easily. purple gems are used in battle to obtain ap back while atually attacking.to get purple gems you have to knock the enimie down like a move called fire storm.atk while they are on floor not in air. if you atk while enimie is in air you get blue gems which are use for more exp. well I prefer using rangers bc you get atkacks that are like 4 hits so you can aquire more purple gems mean more atks. you can do like 80 combo when you get 4 rangers with ability spiritual control. spiritual control lets you get more purple gems.