Ever fancied a trip to R'lyeh to take out one of the Great Old Ones? Do you like the vibe of games like Eldritch Horror and Arkham Horror and want to recreate them in D&D? Have you ever just wondered what Cthulhu's stat block would look like in 5th edition? If so, this adventure is for you!
There are some quite contentious claims out there about the origins of D&D’s creature catalogue. Was D&D inspired primarily by Tolkien and European folklore, for example, or was it more international? How many monsters did Gary Gygax invent, and how many are based on real-life mythologies?