Oghma Infinium

The Oghma Infinium is a book from the Elder Scrolls canon. It was rewarded to the Nightmares for completing Hermaeus Mora's quest to find her champion.

Reading it allows one to enhance skills in one of three paths-Might, which makes one stronger, Shadow, which makes one stealthier, and Magic, which increases one's magical ability. However, it can only be used once-It disappears after the fact.