By the way, not trying to talk shit on you or anything, but I would like to share a tip I learned some time ago. When you have a servant with self 50% charge, you should usually use it first then fill the rest with both Castorias. This way, if in the 2nd turn you're short of 30 or less NP you can use only one skill and save the other for the 3rd turn.
The thing is... Farming Assassins or Berserkers was never an issue with Arts looping cause Sieg exists Use your omni loopers like SpIshtar or S.Musashi for everything else, and use Sieg for Assassins and Berserkers My Dragon boy deals 200k Damage with class advantage on his side, that's legit more than My NP1 SpIshtar. And with fulp refund with a 30% battery in case you face 3/2/× or 2/3/× waves
You guys have to stop saying ah this isn't troublesome because this servant exists, you shouldn't use this setup because this setup is better with x character, bruh not everyone has all the servants in the game stfu
Ibuki will come way later at that point get a melusine/morgan if you want a damage dealer if not then koyanskaya is your friend, im assuming you're playing on NA
Summer Ibuki is better imo, but there's literally over a year and a half of difference so you could roll for both (except I read this late cuz his banner is alr over)
Every Ibuki ascension is god tier cuz all of her costumes hit the spot for me 1st asc: HUGE one piece 2nd asc: Cheerleader 3rd asc: fishnet galore and mascara. Or maybe I'm just a massive Ibuki simp lol