A hidden and forgotten arcane laboratory lies buried, tucked away and secreted. A long forgotten practitioner of the arcane conducted dark magic experiments here and has not returned to this place in a long time. Who created this chamber and its defenders? Perhaps tampering with the contents and various eldritch objects within triggers a magical alert or beacon. The consequences could be far reaching indeed…

• Modular Location — This location could fit nearly any place where several rooms could be secreted away. This includes a dungeon environment, an urban setting or an underground facility.
• Fifth Edition Encounter for characters level 10th-17th
• Environmental Hazard — Survive the eldritch defenses or take control of the magic circle yourself!
• New Magic Item — Shield of Returning
• NPC — Supernatural Soldier, based on the Supernatural Soldier CBG
• New Monster — Eldritch Warrior