who makes this stuff?

[Alice_89th]

If I remember correctly, the SMN and SCH relics are brought up by people as stuff of legends.
Because both were more or less lost arts, there aren't many people that know anything about them anyway.

I can't remember what kind of book the other SMN in the job questline wields. Same with the SCH questline, not even sure we saw a book in that one.
EDIT: the SMN appears to be using Ifrits Grimoire. The SCH (in the small glimpse you get) does have the Omnilex equipped.