Personally, Ragna's 4B challenge in Regular CS I can't do. I've tried it over hundred times, and I'm not sure that's hyperbole either, perhaps far more. I CAN'T get that Inferno Divider to connect!
This is a problem I always have with all fighting games; I can spend hours in training or challenge mode trying to do a combo, and never get it, even if it's supposed to be really easy. The ONLY person I've ever been able to learn any combos with is Lamda. I can do her sword summoner archtype; DDDDDDD-Crescent Slash! And sort've do a corner combo that consists of CCCCCCC-Cavalier-CCCCCCCC-Cavalier-CCCCCCC-Cavalier-Backdash.
Going by that, have any suggestions on what kind of combos I might be good at? (Those D's seem to be more about visual timing, unlike most other combos.)