Laikesi Yi

Yi Lai Ke Si was once the Scion of Light having been shown to be an even more exceptional than Long Hao Chen at a early age, but as fate would have it his life turned as his lover Fu Luo's betrayal, Changing him into abandoning the light that once bathed him in radiance turned to darkness seeking power to exact his revenge and to wipe out the human species.

He appears in Soul Land 2 as a soul fragment to the protagonist.

(Source: Shen Yin Wang Zuo Wiki)