Their goals
Still by the fluvial area and looking at the edge of the water, "When do you plan to attack Ardenia, your Highness?" Neo was the one who asked.
He and Davina were better acquainted with Zephyr's ambition more than anyone. They were conscious of the fact that he wanted to dominate everything and everybody and that he would stop at nothing to reach his goal.
Davina opposed it several times because she feared for him but zephyr just wouldn't listen. He belived that, being at the top was better than being at the bottom and submitting to the people at the top.
He had conquered other realms and Neblon was only the third to the last of his list. If he finished the two, it makes Ardenia superior to all and no one will dare to attack them. Just the thought of it would scare them to their bones and that was what he wanted.
Whether Zephyr had a law to decide or not, they would be forced to accept it. Otherwise, they would face the consequences.