Sweet Shub and Hella Thotep: A Breakfast Cult Expansion (2016)

From publisher blurb:

In the Weird Age of the late 21st century, the newly-discovered occult sciences are changing the world. If you want to learn them, Occultar Academy is the place to go. In this secluded island school, talented students from all over the world can learn sorcery and occultech under the Miskatonic Foundation's watchful eye. But while the Black Library lies beneath them, the island isn't as secluded as they think...

Sweet Shub And Hella Thotep is an expansion pack for Breakfast Cult, the Fate Accelerated game of cosmic horror and high school drama. Sweet Shub brings some of H.P. Lovecraft's Cthulhu Mythos to Occultar Academy, with:

• An optional alternate setting, that adds a little Miskatonic to Occultar's backstory.
• Five new characters: Marcy Bishop the restless artist, Taro Isoge the loyal Student Council lackey, Yvonne Legrasse the detective's daughter, Ambrose Quincy the sheltered jerk, and Lee Tillinghast the high-tech hustler.
• Four Ancient Ones drawn from the Cthulhu Mythos: Great Cthuhlu, Nyarlathotep (a "classic" version and their new Occultar avatar, Your Best Friend), and Shub-Niggurath.

Ancient One writeups for alien Incursions by the Deep Ones and Mi-Go.

• New encounters, including Lovecraft's Ghost, Eko Onbekend the Deep One prophet, Herbert West—Science Teacher, and a statistically valid sample of the Thousand Young.

The Great Old Ones are coming. To survive until your entrance exams, you'll need to solve mysteries, uncover terrible secrets, and find out which of your classmates are conspiring against you before it's too late!