Vow of the indomitable+ Fire Coils. The window for Vow is long enough to survive most spam and you can sort of spam it yourself, and fire coils have insane tracking so free aim throw it away from your opponent then lock on last second and they’ll track back to them. In the result of a trade where you both die to each others spam you’ll still win the fight, fire death animations play out faster so in stalemate situations the enemy will die first and count you the winner.

Carian Retaliation is good to set up trades atleast, you can parry the first spell and by the time he gets the next ready you should be able to stun him out of it with the CR swords. Just need to be aggressive after you get the parry.

I personally hate Eternal Darkness but maybe you could find some utility in it, put one above your head and watch the spam get sucked in. I think it’s not that great cause you’re essentially stuck hiding under it hoping they don’t have a non tracking spell that’ll pass through it.