"Before I leave, my lord, I have a gift to help start your learning" the Dementor pulled out three books and handed them to me; the first book was the condensed history of the underworld (over 600 pages condensed my ass), the Evans Family book of spells and powers (and that's how I found out my mother might not have been muggle-born) and last but not least underworld's species: ranks and abilities an overview of the creatures within the underworld.