Oryx recieved the Taken Power from a Worm God Akka, who probably recieved it from the Darkness itself. One could speculate, that since Oryx proved he wasn't as strong as the Guaridans, he too was taken, and now that power falls back to it's rightful wielder. And since Akka is dead (possibly), that power now resides with the Darkness itself. And could be bestowed onto those that prove they are the strongest through Sword Logic. Since the Guardians defeated Oryx, we might be viewed by the Darkness, as next in line for this power.