User blog comment:Fainz/Question/@comment-27359021-20160808233515/@comment-29196789-20160823171701

i agree with this.

she probably learned about magic from self-study, rigrit, and whatever the player characters from the 13 heroes taught her, and 5th tier was probably their limits (the player characters were relatively low leveled, fighting class, and like ainz probably had no idea how to teach magic, except through indirect means like ainz is doing with fluder).

also, her bug spray may be more powerful than 5th tier, it was never stated