Within Buddhist lore, the Nio, the twin guardian statues who decorate the entrances of temples, dojos, and various places related with religious importance, are believed to be the embodiment of wrathful deity bodhisattvas such as Vajrapani, Mahasthamaprapta, Vajrasattva, Acala, or various figures within Buddhist legend who accompanied Gautama Buddha during his journeys to spread his teachings to protect him and aid in cases needing justified force.
