5E Cthulhu Mythos: Have You Found It: Act 3: Oratorio
Despite their victory, the heroes’ reprieve is short-lived. The Yellow Sign, now emblazoned upon the moon, shines down upon Tiarazan and spreads the vile corruption of the King in Yellow. With each passing hour, the machinations of a young aristocrat threaten to topple the city and given time, threaten to bring the entire world to madness. Everything comes down to a race against time, a dangerous visit to a mansion trapped between worlds, and a journey to a murdered world to face the powerful messenger of a Great Old One.
This adventure path for 4 to 5 characters starts at 8th level and ends at 12th.