Abiyoyo

An Abiyoyo is a monster from African folklore. Parents tell their children to behave and go to sleep if they do not want it to take them away in the middle of the night.

Tristan Strong Punches a Hole in the Sky
When at the Ridge, Tristan Strong creates an Abiyoyo to explain his quest to the Ridgefolk, however it want on a rampage in the city and Tristan and his friends aided the Ridgefolk in defeating it by saying its name.

Trivia

 * Abiyoyo is similar to the Bogeyman.
 * Abiyoyo is based on a song by American folk singer Pete Seeger.