I manage kill The Fallen at my lowest br60. i juz use unique leader with all party, do all quest and some grind stat and item finding to get better weapon for my party members edit: if you va a battlerank around 80 it should be no problem to defeat him. otherwise upgrade the weapons of your party. make sure, that in each union is a healer/recoverer. furthermore it is useful to have a yama-union (4-5 yamas), which act like a kind of shield for you (=high HP)