User blog comment:GotMilk5101520/Silver Backstory & Tartarus and the Tower of Heaven/@comment-120.28.127.231-20140605030025

We will know the true story on the next chapter of Tartarus: Father and Son refers to Silver and Gray's past, history and how are they related to each other..

I think that Gray is a half-demon / half-human. He's demonic powers is still hidden and soon to be unleashed as he faces his father, Silver