CORNBRINGER
I would like to see when he gets back to his home world that he would have a meeting with the justice League with an appeal to kill joker maybe he would bring evidence from the injustice world. the JL could agree to it or hide joker away because they can't arrest MC for something that hasn't happened yet , making it a win win either way.
Ok correct me if im wrong but I don't remember the MC allowing Trigon in his mental defenses so how is he in his mind trying to take over I mean both Martain Manhunter and the Green lantern core couldn't forcefully get in his head and I know Trigon is like stupid op but wouldn't the MC at least know that Trigon broke through?