Avifors spellbook

The Avifors spellbook is a book that contained information on the spell Avifors. It also contained the instructions on how to preform the spell. Professer Mcgonagall owned a copy of the spellbook and placed it inside an underground obstcle course where she tasked her students to retrive the spellbook.

The Avifors spellbook is located on the other 

''side of the crawlspace. Once you have managed to ''

''collect it, the Avifors spell will be yours. (Professor mcgonagall talking about the spellbook)''