Isekai Onmyouji to Juuni Tenshou no Shikigami

The strongest onmyoji in history, the master of all spiritual techniques and served by the Twelve Heavenly Guardians as his shikigami, was tragically betrayed and killed. However, on the verge of death, he managed to transmigrate his soul to reincarnate in another world. He became Wayne, the third son of a high-ranking aristocrat. In this world,...