The Cthulhu Mythos in the works of HP Lovecraft The Cthulhu Mythos is a universe created by HP Lovecraft through his tales containing important fictional characters such as the Great Old Ones, Outer Gods and Elder Gods . This myth is very important and perhaps the most essential part in all of Lovecraft's works. It reflects Lovecraft's dark world and grand imagination as a sort of reflection of his childhood nightmares and the dark stories his grandfather told him. Deities with different qualities easily show Lovecraft's genius and are highly inspirational, inspiring many modern horror writers. The myth, like Lovecraft's other works, was not appreciated or recognized during the time he was writing. It was thanks to August Derleth that his works and the Cthulhu myth received due attention and became an open universe. This involved a process of expansion as many important writers, especially Derleth herself, contributed their own stories to the myth, following the path created by Lovecraft by using some of his deities, his key elements and even creating their own. they cover several things about the myth, each of these things helps develop the idea that this myth is the defining key element of Lovecraft's works as a whole. Through proper research of this very myth, one can learn about Lovecraft's unique style, Lovecraftian horror, and the horror genre as a whole. First, to properly understand the myth, it is necessary to define it. Important elements of the myth will be defined as Great Beings, Great Old Ones, Outer Gods, Elder Gods and the like combined with other creatures such as The Four Horsemen, Ubb and Yugg. Then the topic will turn to the first appearances of... half the card... and unconscious themes. The reason he was unconscious while slowly building the myth is because he was not aware of the myth-making process. This is part of the fact that his works were not widely recognized in the period in which he was writing. The reason we have the Cthulhu Mythos as they are today and Lovecraft's works as a whole is because Derleth put them together. He tidied up the myth, leading to contributions from other writers. The Derleth phase began. In the “Derleth phase,” August Derleth made the Cthulhu mythos and the works of Lovecraft widely known and popular. Lovecraft had no intention of creating a myth or creating a complete universe. It has been slow and steady progress. This is clearly seen in his works prior to Call of Cthulhu. His real intention was to keep the myth as we know it today, as a “background element”.”.