Heifeng Guai

The Black Wind Demon eventually surrenders to Guanyin after she uses one of the artifacts that the Buddha gave her (similar to the ring on Sun Wukong's head), and becomes the mountain's guardian deity.

Sun Wukong engaged in multiple battles with the Black Bear Spirit but failed to retrieve the robe, so he sought help from Guanyin Bodhisattva in the South Sea.

[7] Guanyin Bodhisattva transformed into Lingxu, a close friend who was supposed to celebrate the Black Bear Spirit's birthday, and presented an elixir as a gift.

The Black Bear Spirit swallowed the elixir, disguised as Sun Wukong, but suffered great pain and revealed its true form.

Guanyin Bodhisattva retrieved the Buddha's robe for Tang Sanzang and used the Golden Cincture to bind the Black Bear Spirit, compelling it to convert to Buddhism and become a guardian deity of Mount Laojia [zh] in the South Sea.