So the two dragons who refused to make someone take the causality is the white dragon/ light whatever that they thought were dead ( which I think he disguise himself as a sage? To unravel causality that binds the black dragon ) and the emperor whom the hero obeys obediently because she's the golden dragon. And the black dragon is not dead but merely sealed, which becomes the target of the wraith organization caused by the other dragons.
So the two dragons who refused to make someone take the causality is the white dragon/ light whatever that they thought were dead ( which I think he disguise himself as a sage? To unravel causality that binds the black dragon ) and the emperor whom the hero obeys obediently because she's the golden dragon. And the black dragon is not dead but merely sealed, which becomes the target of the wraith organization caused by the other dragons.