You killed Fuzzfazz? he drops a dead frog, and it's worthless
Bishops start learning lvl 6 spells (those you can't learn from books) at lvl 14. You might want to look at
Flamestrykes for more non-spoiler info. Almost all spells at lvl 1-5 can be learned from books, and banish (lvl 6) can be learned from a book as well.