The Prince and God's Vessel

When the Empire experiences a dire situation with an unknown curse plaguing the entire country, what could they do? Surely god's vessel would know how to fend off such a calamity from plaguing the country, even though this insufferable vessel of god sought to gain something in exchange for every time she had to lift a finger. But Prince Adelai knew better than to rely on some opportunistic vessel of god to make a move on her own— and he was right. Now he was forced by the Empress to persuade the vessel— Lord Senia, to save the people from the disaster. But why should she go out of her way for people she doesn't even know about? What could she possibly gain from doing that? Why would she do it?.... Unless the Prince was willing to make a deal?