The Heaven-Defying Art

The protagonist is a son born to a concubine, and his birth mother is persecuted by the principal wife. Bullied by his elder half-brothers from childhood, he is born with a crippled spiritual root that leaves him unable to cultivate. At last, he flees his family home and meets a mentor along the way. Using a magical treasure in place of a spiritual root, he embarks on the path of cultivation and revenge!