In common with Mahayana schools, Tibetan Buddhism includes a pantheon of Buddhas, bodhisattvas, and Dharma protectors. Arya-bodhisattvas are able to escape the cycle of death and rebirth but compassionately choose to remain in this world to assist others in reaching nirvana or buddhahood. Dharma protectors are mythic figures incorporated into Tibetan Buddhism from various sources (including the native Bön religion, and Hinduism) who are pledged to protecting and upholding the Dharma. Many of the specific figures are unique to Tibet. For more information on Tibetan beliefs, see the articles on the Five Dhyani Buddhas, the wrathful deities, and Tara.