Thor's Day: Sybylline Books for D&D 5th Edition

SIBYLLINE BOOKS 

Wondrous item, artifact (requires attunement by a wizard)

• When casting divination spells, you don't require any material components.


• You gain a +3 bonus to AC.

• You may cast the augury spell once per day.

• You may cast the hunter's mark spell three times per day.

"They were a collection of oracular utterances, set out in Greek hexameters, that according to tradition were purchased from a sibyl by the last king of Rome, Tarquinius Superbus, and were consulted at momentous crises through the history of the Republic and the Empire."