[CobrastanJorji]

I don't think using the name Fable is wrong, but I think a pool of Fables should be called a Grimm, or possibly an Aesop.

[SauntSolaire]

Perhaps Grimoire?

"A grimoire is a textbook of magic and sorcery. Traditionally, it contains instructions for casting spells, performing divination, creating magical objects like talismans, and summoning supernatural entities such as angels or spirits."

Seems to fit.