this eidolon is the hardest one out of them all
he is more powerful and more deadly than the other eidolons combined,
saying that this boss is no match for me
here is how to beat him
lets talk paradigms
we need
SLASH AND BURN
LIFEGUARD
DIVIDE AND CONQUER
STUMBLING BLOCK.
first off we need a fortisol before the boss that's point 1
point 2 we need to use both
DIVIDE AND CONQUER
and
STUMBLING BLOCK. to inflict deprotect and anything that will weaken it's defences
after it's been weakened you must then use
SLASH AND BURN to attack him.(you'll find it is very effective since you weakened hecatonchier with the other 2 paradigms)
and most importantly both vanielle and fang must be above green health status and that's when LIFEGUARD comes into play.
if fang gets incapacitated then quickly revive her with a phoenix down or use renew.get her back in the fight since you have a friggin doom counter above your head and you have very little time to beat the boss on your own and having fang alive is mandatory to your survival and your goal is to win.
that should leave
barthandalus,yaag rosch and orphan to beat now and a few more sub mini bosses to beat along the way.