A Swords & Wizardry Adventure Module for 4-8 characters level 3-6.
Comprised of two parts:
Throne of the Toad King
Stone Cyst of the Shroom Priests
From the back cover:
"Establishing themselves in the cyst left by their dead god, a zealot band of Shrooms, a race known for bizarre projects and subtle objectives, has now been working for decades on the strangest task of their strange history.