From publisher blurb:
The Stars Are Right . . . for Slaughter!
Once every dozen generations, the Yellow Moon rises over Thule. This rare alignment is sacred to the cryptic god known as “the King of the Stars” and its delusional followers, the Golden Ones. Most people believe that this wandering cult is made up of addled fools and harmless dreamers. But now Night of the Yellow Moon draws near again, and the time is at hand for the Golden Ones to earn their god’s favor by converting or killing all in their path. For the “King of the Stars” is none other than Hastur the Unspeakable, and the heroes must put an end to the cultists’ rampage before they invoke unimaginable catastrophe!
Night of the Yellow Moon is a 24-page PDF adventure for 3rd level characters, set in the Primeval Thule campaign setting. This version of Night of the Yellow Moon is compatible with the 13th Age Roleplaying Game.