so... how the hell do u beat captain madison in satasha hard?

[Sylve]

you only need to kill 2 tentacle near the entrance and stay at that side then caster like BLM can hit the boss, no need to kill all tentacle. About world end, IF the hp of caster (assume ilvl 100) is full or at 3k hp, you will not die, world end deal around 2k+ dmg

An easier way to deal with the fight (albeit, takes a bit longer) is to focus down the {Krakens Arms} and ignore the Tentacles. Kill enough Arms and he wont do the KO shot.
It take slonger because you're spending less time on boss, but it makes the fight pretty easy.
Krakens Arms -> Kraken Main Body - ignore Tentacles.