Guardian has so much to offer in terms of hand-waving explanations!
*It's a Dixing power Shen Wei learned somewhere.
*Lin Jing did a thing with computers.
*It's a Yashou power that was never mentioned before and will never come up again.
*The Hallows did it.
*No one knows; could it be Ye Zun?
*Zero explanation offered, just roll with it.