The Infirmary of the Academagia has its own private library: a strange and eclectic collection of works pertaining to Negation, to potion-brewing, and to a range of tangentially-related fields of study. The place isn't technically open to the student body, but for the most part the nurses only object when visiting kids are actually in the way.
Chance of discovery: 10
Study at the Infirmary Library: Studying at the Infirmary Library grants 1 Skill Step to 1 random Subskill from [each of!] the Negation, Brew and Natural Philosophy skill lines every other day. It can be used multiple times in one day but not two days in a row.
completing Stage 3 of The Upset Stomach