The Chosen Ones

For small talk please join the chat
You could get some tips and strategy suggestions there how to defeat Faerga on every difficulty.
But if you don't want to do that, just use "give up" (sell all your stuff beforehand) and try to gain better equipment while you replay the game with more money (Your amount of money at the moment you use "give up" is also the amount of money you have in the beginning of a new TCO game). That does always help for outgearing the boss (which is pretty easy in ch.6 if you have enough money, know how to synthesize the items, search in every corner of the map for minibosses and try to complete every set).