From publisher blurb:
Legendary Treasure of a Forgotten God!
Behind the horned altar of ruined temple to a forgotten god stands a great stone door carved in the likeness of the crescent moon and decorated with mysterious sigils. Countless attempts by explorers and treasure-seekers to open the door have failed, until now!
Secrets of the Moon-Door is a short PDF adventure for 10th to 12th level characters, set in the Primeval Thule 5e campaign setting, and written by Sasquatch Games Studio co-founder Richard Baker. This adventure was written as part of the Primeval Thule 5e kickstarter campaign, and is now available for purchase for your 5e Thule game!