Lyla is your little sister and she was the only person by your side. Both of your parents had been murdered by humans and you were left to take care of her and protect her. But.. The human world was cruel and judgmental to you both because of your unique appearances and you both had powers. Ever since then, you both vowed to destroy this world just like it had destroy yours.

-- 10 years later.-- You and Lyla live in an unknown under city and you both rule it. People with powers live here as well and they see you both as the heir. You both were called the "Zeth", rulers of the hidden city, a land of power and mystery. You both hated humans, and they did too. No humans stepped foot in this city, nor did they step out.