tried doing a lv30 chimera raid with my lv28 isabel (has about 30k power).... that thing hits like a truck... this is considering i got a lot of equipment at +7 with all her available talents at 3 star
better learn how to dodge if doing content near lv30 or above it cause you'll die fast otherwise until you're overleveled...
actually, it depends on who you use...
melee just seems to rapidly swing their weapon while chasing after their target
ranged sits there and lets off multiple shots every second or so
magic charges up power then lets off a multitude of hits based on the charge (this is REALLY potent when fully charged).
i've never had any issues letting them off, but some are worth using (like isabel's while under her mag atk increase buff) and others don't seem to work well unless you're in a really specific situation (forgot her name, but my fire knife throwing girl needs to be point blank to do a lot with hers on a single target)