The Monarch was nearly bored to death. He wasn't an Undead who liked to sleep. Normally, he'd shout about going to hack someone, but when there was no one to hack, he'd rather open up a few small vegetable plots in the Resting Camp and summon a few little skeletons to plant vegetables than to go to sleep.
When he first learned there were other worlds beyond the Master Plane, he was thrilled, willing to abandon his already-broken-through Black Crystal Body to throw himself into the Star Burst Plane for a fresh start.
After Ange sorted out the Ancient Godlight, his first reaction was also to let Ange throw him out to break through the Energy Level Great Desert and start anew in the Divine Light Alliance.
In essence, the Monarch was just that sort of restless old guy, always thinking about making big moves.
