Book 3 Chapter 10: The Great Library is 10th and the final chapter of Bookworm Adventures. In this chapter, You face Professor Codex, but also the bosses that you encountered before is Cerberus, Medusa, Shaitan, and lastly, Wolf-man. After that, Codex appears with his cape. Mostly you might need the Aegis of Athena for this fight.
Treasure: Magic Pen
Effects of The Treasure: Chance to Stun your opponent.
Required Treasure: Aegis of Athena and any treasure