Moral High Ground.
The thing that holds kings of law back from becoming titans of law is the image of their concept and the chances of success in creating it. A king of law must know what they want to be and how they want to be. Some kings need inspiration but no amount of inspiration will be good enough to combine 9 laws into a concept. That's why the sage was sure that Soverick will take the bait as soon as he saw the pillars that led to the competition arena.
Soverick got a taste of the Sage's law of order during their first meeting. Then he saw that the pillar has hints of it. He will surely try to get more of the law of order to fix the problem of his concept. A concept is a tiny aspect of the law matrix of the universe, the law of order is the backbone. So Soverick should be able to find something that will help him to become a titan of law from the sage's law of order. That's why the sage used his law of order as bait.