A Little Knowledge (5E)

From publisher blurb: A Little Knowledge is a 5th-level adventure that takes the PCs across the Stoneheart Mountains onto the forbidding Feirgotha Plateau to investigate the myths and tales surrounding the ancient and presumably deserted Library of Arcady. The PCs soon discover that the venerable building is not as abandoned as originally believed, and its unusual caretaker keeps more terrible secrets than any of its fabled lost writings.