Goayr Heddagh is a luminous ghostly-goat that lives in the mountains and they has been heard of in manx mythology. They haunt travellers that stray on the Island of Man and they bring them a bad luck. If anyone challenge or tries to attack it, it will run off.
In popular media
In the Secret Saturdays: Beast of the 5th Sun video game, it appeared as a luminous ghostly mountain goat in the Baron Finster Level. It can change colors, alternating between Red and Blue; one of these colors has a psychic power.