[@Dawnscroll]
Don't worry, she won't have room for using it often without protection and it's pretty tiring too.

There are several cases actually. In Fate Rider can't kill Shirou (she was going easy on him, but still), Rin killed Berserker once and Shirou along with Saber killed Berserker several times at once. Then in UBW Shirou holds his ground against Archer and in HF he kills Berserker and cripples Saber Alter. Seriously, this rule doesn't hold much water at this point.

Thanks. I added a minor adjustment to Phantasmagoria anyway and added a number of circuits and improvised a rank. Will try to think of a family name too.