Yaoguai, yaogui, yaomo or yaojing is a Chinese term that generally means "monster". The term is usually used in Chinese mythology and folklore.
Mythology
Yaoguai are mostly malevolent animal spirits or fallen celestial beings that have acquired magical powers through the practice of Taoism. The evil ones are usually referred to as guài or mó in Chinese. Their greatest goal is achieving immortality and thus deification. But monsters are not usually thought of in a religious sense. In Journey to the West, the demons seek this mostly by the abduction and consumption of a holy man. Not all yaojing are actually demons; some others are of quite unusual origins. In the case of Baigujing, she was a skeleton that became such a demon. Many yaojing are fox spirits, or according to the Journey to the West, pets of the deities. There are also yaoguai kings that command a number of lesser demon minions. In Chinese folklore, the Chinese hell is a place that is populated by various demonic spawns. Most of these demons are influenced by the Indianrakshasa or yaksha and therefore bear some similarity with the Japanese oni. In Japanese, yaoguai are known as yōkai.
The Fallout series features mutated bears identified as Yao Guai. These creatures roam many parts of post-War America, appearing in Fallout 3, the DLC Honest Hearts, Fallout 4, and Fallout 76. They attack both the player and various non-player characters. In Fallout 3, one of the in-game radio stations broadcasts an occasional public service announcement reminding listeners "don't feed the Yao Guai". In Fallout lore, the Yao Guai were named by descendants of Chinese internment camp prisoners.
The Taiwanese black metal bandChthonic has a drummer who wears a metal mask of a black demon mouth.
Once Upon a Time featured a creature called a Yaoguai in the second season episode "The Outsider". Here, it was depicted as a large lion-like creature with a mane of fire. Maleficent transformed Prince Phillip into a Yaoguai until it was undone by Belle.
The Yaoguai's Yaomo alias was used in AdventureQuest Worlds during its 2014 Akiba's New Year celebration on Yokai Island. It is depicted as a horned half-demon half-horse creature with additional eyes on its chest and parts of the horse body. It was responsible for corrupting Akiba's Jingshen Forest causing the Qilin Senlin-Ma to enlist the player for help. The players were able to defeat the Yaomo.
An episode of the television seriesSleepy Hollow features the Yaoguai as a demon who is attracted to aggression and gunpowder from a gun.
In the 2017 movie Wish Upon, a Yaoguai is the spirit of the music box. If the seventh wish is granted, the Yaoguai will claim the soul of the owner.
