Professor Gracklebone is a customer at the Arceuus House Library. He seeks certain texts within the library, and will ask the player to retrieve them. He will give players a book of arcane knowledge once a text is turned in, in addition to 1.5% favour.
Professor Gracklebone is the solution to the medium cipher clue QSPGFTTPS HSBDLMFCPOF. The answer to his challenge question: How many round tables can be found on this floor of the library? is 9.