Mediator
'Demonmir, what the fuck are you up to?'
Gregory asked Demonmir through voice communication. Of course, he sounded furious. He remembered Hansen's advice about Ottoman given to him before they fought each other.
Hansen had told him that if Demonmir could outplay them, he would outplay anybody. Gregory started to believe Hansen's logic. But he believed it too late. At this point, Demonmir had already made this a three-way fight.
Demonmir did not keep Layos in the loop while partnering with JJ. It could be said that he used Layos' forces as a tool to make it easy for JJ to be here.
Demonmir had a reason to join hands with the Last-Blood Bastion. He wanted to become a half-blood himself. So he could better use his demonic powers.
The advent of war made it easy for Demonmir to work on his plan. And he made effective use of both kingdoms to receive a favor from JJ. Layos still needed Demonmir. So he didn't want a total confrontation with them.