We usually neglected chasers in DFO, just use the monster skills, or too wide spread too much. When they got together, we can normal but junk attack and chaser is pretty good, and some more, just like two times. Another thing we thought of doing was, when we are up against Expellers in Vestibule of Darkness, is to spam the normal melees back arrow to obtain chasers while they are breaking out of the statues.
We can usually grab like 4 really fast like that, and when they finally do start moving, we can spam normal attacks and chasers like mad for insane damage (Dungeon Fighter gold). Takes like three seconds to destroy a mob like that. And it helps that they are always lined up so neatly. We provide Dungeon Fighter Online gold for you.