I would recommend you to keep heuksal for the passive and maybe remove heuksal skills too to get more sp for bicheon.
fire 56 ---> good get all skills here but mainly nukes
lightning 56 ---> good, get all skills except imbue
cold 37 ---> keep it there in the future u will have to choose ice def or heuksal passive
bicheon 19 ---> lvl it up a lot, get the passive and kd+stab at least
heuskal 41 ---> lvl it up to 60 for the passive only
