Duma

Duma is the final boss of Fire Emblem Gaiden and its remake, Fire Emblem Echoes: Shadows of Valentia. Along with his sister Mila, he is one of two sibling gods who resides at the continent of Valentia. The patron deity of Rigel known as the War Father, by the events of the game, he has been denounced as a Fell God by some because of his descent into madness.

(Source: Fire Emblem Wiki)