The Cthulhu Mythos is a fictional universe created by H.P. Lovecraft and is by and large held to be among the greatest works of "modern" fiction of all time, notably gaining immense popularity among horror fans. The idea of the verse is a reality created by a mindless and all powerful being referred to as Azathoth, who resides at the center of the universe with all outer gods.
Power of the Verse
The Cthulhu Mythos is possibly the most powerful verse in modern existence; it contains a literal infinity of Tier 1 entities as well as a Tier 0 entity. It seems very likely that almost all the characters have vast powers of Higher Dimensional Manipulation, Reality Warping, and more typically-considered hax abilities that make them a nigh-unstoppable force.