Nitocris

I havent got her but i would think so, her instant death np was very good for farming in the last event, so if you could use a bit more farming efficiency then shes worth it

Yep. Self charge and np instant death. But be warn, her np is mainly used to kill bronze enemies with high HP. The rate is not too good on silver and gold ones.

Also her final ascension art is quite titillating

Nitocris is hailed as best farming servant in the game on many fgo related websites. To be honest I don't share this opinion.

Even at max leveled skills with 150% death success rate most enemies resist her instant death mechanic. Looking at pure damage, her NP is way too weak to deal with enemies that don't die instantly. She can dish out perhaps 12-15k neutral damage on average with her NP - not enough to clear one wave of hands by a long shot.

What's the point of instantly killing bronze enemies with 10k hitpoints each? I don't get it. Every other AoE NP can take care of those, and do much more. Heck, I can even use 3 buster servants and be more efficient than using Nitocris.

Despite having a max leveled Nitocris I use 1* servants like Arash and Spartacus for farming, who are stronger and way more reliable.