Yuna

Yuna, The Goddess of Chaos
Yuna is the Goddess of Chaos who was incased in an old bronze medallion that is carried by Mist, Ike's little sister, in path of Radiance. She is only seen as a dark god who must be kept inside the medallion at all costs. Throughout "Radiant Dawn" which takes place three years after "Path of Radiance", Yuna is still seen as an evil being trapped inside the Medallion, or Fire Emblem due to its strange blue glow.