Series Legacy of the Divine Bone

Long Yao, the eldest son of Dragon Emperor Long Yan, was afraid of losing his status as crown prince because his half-brother Long Teng possessed a rare Sacred Bone inheritance. He forced Long Teng to hand over the bone by threatening the life of Long Teng's birth mother. When the Dragon Emperor was meditating, Long Teng, who was cornered between the pressure of the imperial advisor and the threat of his mother's life, finally gave in. However, Long Yao broke his promise: he killed Long Teng's mother, erased her memory, and then banished her to the human world.