Mohg "The Lord of Blood"

About

Mohg, more commonly known as the Lord of Blood, was born the son of Queen Marika the Eternal and her first consort, the Elden Lord Godfrey. Mohg and his twin Morgott were born Omen, their appearance marred by animal traits, such as Mohg's horns and wings. In ancient times this had been considered a blessing, but during the reign of Queen Marika it came to be regarded as a curse. Mohg and his twin were imprisoned deep below the Royal Capital.

In his exile deep underground, Mohg made contact with an Outer God of blood known as the Formless Mother. The Formless Mother ignited his accursed blood with fire, prompting him to develop powerful bloodflame magic.

(Source: Elden Ring Wiki)