The Fifth Edition content in this book explores new, darker paths for adventurers to follow. Beginning down one of these dark paths leads to power but at a perilous cost. Heroes of the dark face insurmountable odds and challenging decisions whether it is worth the cost to fight against such forces by tapping into the same source of insidious influence as their terrible foes.

In a hidden library miles below the ground in the city, a librarian collects books slated for burning, missives never meant to see the light of day. A small complex and vault of secrets, those who know of the Forbidden Library are few and those who have been inside even fewer.

• Adventure scenario for four 4th-5th level characters
• 5 New Creatures including the Library Drake — a new variant familiar option
• 2 New Subclasses — Facedancer and Oath of Secrets
• 4 New Magic Items