I dropped her by equipping all the speed+ items I had along with the dark elf dagger, setting agility tactic and using the dark elf covenant for the most part. Hard thing to deal with at that point is her sword which is going to kill a covenant every time she uses it ( and they stay dead for the remainder of the fight yaaaay) but if you're at full health you can survive the first 3 times she uses it. First covenant to die was... I can't remember, might want to pick something with high phys def ( the elemental that lacks hands maybe?) the second was the fire imp queen, had her shield up for good measure, last was steam elemental make sure you're dispersed when she hits or you'll die. If you haven't gotten her to the lust attack phase by her 3rd sword swing you might as well give up .
Without the dark elf... I guess the bat-harpy would be the next best, what I was going for was enough speed to get in a ton of attacks AND to hopefully dodge some attacks. It really helps to manage her damage output when she misses 1/3 to 1/4 of her attacks ( I don't doubt for a second that the sword is aguaranteed hit though) . And yeah a fair amount of luck is involved.
No clue how anyone got past her first phase without cheating ( I just dropped her shield to 1 HP using cheat engine after I figured out I couldn't put out enough damage before she tempted me).
Seems like the dev really wants players to feel completely underpowered from chap 6 onwards. It's shitty and not fun in the least, which is unfortunate as it obviously took alot of work not only to make the game in the first place but add onto that all the work necessary to make the bosses as frustrating as possible with a specific set of moves that will give you the chance to win the fight.
Good strat for the 2nd phase I will only add for that you can sacrifice any covenant in the first
Sword skill but if you fight her at low level or bad equipment covenants with some extra defense like
Nyx or
Yona are a good choice to die first, and for last covenant to die there's
Enet and her
Balance Skill. About the 1st phase it's easier than it seems her
shield will counter all elemental abilitys so any no-elemental skill are optimal (Vexing Claw, Blade Whirl, Shield Breaker, Aetherflare even your melee if you have Pinna and equip her Assassin Blade you may get lucky and score an Assasinate [her passive skill] for extra damage) but you can also use
elemental skills because the counter doesn't hit that hard you only need to heal regularly, finally there's her
Tempt Skill and that type of damage works the same to everyone the more HP the target have the less the effect and vice versa so all you need to do is keep you HP at max and you will take barely any
tempt damage. I prefer to use Agi most of the time but for both
phases Fervor is probably better option, not only you will get more defense against her special skill and other normal skill but also more HP to tank her attacks also
Fervor gives all your
physical skill a small chance to stun her that will help a lot.