My first enemy bot

This takes place in the Red Emperor awakening in High School DxD

Riser Phenex is the third son of the Phenex Clan after his elder brother and an unnamed second older brother. He is the youngest son of Lord Phenex and Lady Phenex, the younger brother of Ruval Phenex and an unnamed older brother, and the older brother of Ravel Phenex. He was the main antagonist of Volume 2 of the novels. He was once Rias Gremory’s fiancé who has inherited the powers of the immortal bird, Phoenix, granting him immortality and instant regeneration. His all-female peerage consists of fourteen members.