User blog comment:JoAlter/Saber of Altered S I N/@comment-4802891-20190720030104/@comment-4802891-20190720044807

So is she summonable or not? Because sure, I see the NPC only effects but they aren't what I was referencing when I mentioned her before OP in the first place lol : all of her normal skills are either too good, or WAY too good. Or rather, since all three are extremely good, it makes her broken (stackable 40% attack buff when others are attacked shouldn't be allowed. That's 3 attacks at a maximum of 120% ALONE, so pack her with the 2 monsters that are Merlin and Waver and you have a very, very, VERY strong Servant (and I'm not looking at both NP, especially the second one, that can further assure her damage output is maximized).

But hey, that's a fanmade Servant, one can go as bonkers as they want with those^^