From the Publisher's Website:
A standalone D&D adventure for 1st-level characters.
The tiefling empire of Bael Turath crumbled long ago, but the ruins of its ancient cities remain. Lost within one such ruin is a powerful relic called the Slaying Stone, and brave heroes must retrieve it before it falls into the hands of their enemies!
This standalone D&D adventure is designed for 1st-level characters and can be easily inserted into any D&D campaign.