The Cthulhu Mythos is a shared fictional universe created by writer H.P. Lovecraft and expanded by other authors. It features a pantheon of ancient, cosmic deities, including the iconic Cthulhu, who lies dormant beneath the sea, waiting to return. The Mythos explores themes of existential dread and the insignificance of humanity in the face of incomprehensible forces. In this universe, the boundaries between reality and the unknown blur, leading to terrifying encounters with otherworldly beings. The stories often involve forbidden knowledge and the fragility of sanity, captivating readers with their eerie atmosphere and profound implications about the universe.