[quote=@Kost Alter]
[@Moonlit Sonata] Okay so, minor update. I've done the changes you requested on Caster's sheet. However, I'm still having a hard time figuring out the whole "why is she even a Caster" debate. I mean, her NP is capable of producing mysteries, shouldn't that be enough for her to qualify? The qualifications for a heroic spirit to be a Caster in general confuse me, because of there being canon servants who weren't magi in life, like Gilles (though he's supposedly an irregular servant, so idk), Andersen, Shakespeare and Nursery Rhyme who's literally just a book. Some help would for sure be appreciated.

As for my Master app, I'm still thinking of ways to change it. I'll try to get it reworked sometime tomorrow if I can.

[/quote]

Every NP has mystery given that an NP's a crystallized legend, so I'm not sure what your point is? If you mean it generates nature interference, then like I said as it is, that's not magecraft (artificial mystery) so much as an ability inherent to the Phantasm Races (natural mystery), so she doesn't qualify anymore than, say, Ibaraki would.

Nursery Rhyme's not a book, she's a Reality Marble.

Gilles has a book that does magecraft and is a bootleg Caster.

Author Casters have been a thing for a while and it's worth reading their respective source material to see what their shtick is, which makes it pretty apparent why they work as Casters.