Okol Pixan, the soul thieves in the mayan culture. The most disturbing thing about these creatures is their ability to manipulate fear and emotions. As it feeds, it grows in power, and each soul it consumes strengthens it, giving it greater control over the physical world. Some accounts say they can shape reality itself around them, distorting memories and creating terrifying visions of victims' past sins and mistakes, making them relive their darkest moments as they are slowly consumed.