90 fire 90 light 90 bicheon 30 cold : if you're rich and you can afford suns and fullblue shit, this build is focused on squeezing out the 300/300 limit to get the highest dmg possible, not caring about your phy def which will probably be comnpensated with great gear (assuming you're rich).
if not you can try these 3:
1) 90 fire 80 light 70 bicheon 60 cold : higher mag/speed/parry than the last 2, sacrificing br from bicheon passive (1 lvl) and lvl of sword skills (wont make much of a difference in dmg anyway)
2) 90 fire 70 light 80 bicheon 60 cold : higher bicheon thus one lvl higher passive, a lil upgrade on sword skills and keeping decent mag/speed/parry buffs
3) 90 fire 70 light 70 bicheon 70 cold : even the 3 subtrees out. decent parry/speed/mag/defense buffs and all the necessary skills you need in bicheon
the last 3 are the same shit imo. 90 fire is a must, light/bicheon must be 70+ and cold must be 60+.
it will all come down to your gear and weapon anyway...