I unzip my pants, take a hold of my trouser titan with my left hand, and give Vecna much more than he bargained for."I will know everything you see with your eyes and do with your left hand for one year and a day.", your friend and confidant, Vecna.
For every secret gained not only is a secret from the character written down elsewhere in the library but the character loses the memory and experience of the secret from their mind (in other words secrets are not gained so much as traded)
Damn, sniped. I was going to suggest the very same thing. That's what I get for reading the thread through to the end. Your example was better than mine.I like this one. The DM could simulate the "forgetting" by giving the player the caveat that if he chooses one of Vecna's secrets, the DM can add one (never subtract one) hidden piece of background to the player's character that he can use as a future story hook.
I unzip my pants, take a hold of my trouser titan with my left hand, and give Vecna much more than he bargained for.
I feel that modesty is a virtue.You call it the "trouser titan?"
Make the player sacrifice to get the catalog. Leave him in perpetual doubt that this is the true catalog and not one of the infinite possible incorrect facsimiles. Let the totally insane inhabitants of the library find out that he might have the key...Despite — indeed, because of — this glut of information, all books are totally useless to the reader, leaving the librarians in a state of suicidal despair. This leads some librarians to superstitions and cult-like behaviour, such as the "Purifiers", who arbitrarily destroy books they deem nonsense as they move through the library seeking the "Crimson Hexagon" and its illustrated, magical books. Another is the belief that since all books exist in the library, somewhere one of the books must be a perfect catalog of the library's contents; some even believe that a messianic figure known as the "Man of the Book" has read it, and they travel through the library seeking him.


(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.