Talk:SE.RA.PH/@comment-12160982-20170514145559/@comment-95.249.20.133-20170514162555

Assuming you don't have anything too fancy among your servants, go for a stall team of Mashu/support Merlin/whatever damage dealer (art or buster based) and buy accordingly. Take out her charm skill, her HP/NP drain, crit buff, ATK buff and NP buff at least. Then buy the Art (and Buster, if you took a Buster based DD) resist. DEF down and Art/Buster weakness are otpional, if you want to speed things up.

With this setup you can basically survive indefinitely, unless she decides to buff her crits multiple times and focus on one of your servants. If you're struggling for this reason, consider disabling her crit up skill. You can tank her NP either with Merlin's invulnerability or with Mashu's NP +first skill, it took me over 70 turns with Mashu/Merlin/Passionlip, but I've finished at full health, no death nor CS spent. Definitely use a ST Art/Buster damage dealer if you have one (Kuro works really well), sadly all of my ST DDs are Quick based, and I didn't want to buy other debuffs. Take some DEF up CEs if you want to be extra safe.