The Outpost of the Outer Ones

From publisher blurb: From the depths of space come the Outer Ones, better known as the Mi-Go. They travel the universe looking for metal to mine and brains to steal. Now they have landed on a planet ruled by sorcery and steel... YS1 - The Outpost of the Outer Ones is a fantasy adventure module for early editions of the world's most popular fantasy role-playing game, particularly the first Advanced Edition, but directly usable with virtually every OSR game. Despite being inspired by the works of H.P. Lovecraft, it is a dungeon module, not horror or investigation. It is meant for character levels six through ten, depending on which rules system used.