Leaving the Spiritual World 

After listening to Maximilian's advice, Minos sighed at having to make such a choice, leaving part of his wives in the Spiritual World and risking Ruth's life in an unknown place.

Ruth, Gloria, and Abby would be in danger everywhere. Next to Minos, he could try something and say goodbye to them if the worst came to the worst. But Abby's powers were necessary for the powers of the Spiritual World and could possibly be the salvation for many people in his absence.

As for Gloria, if Maximillian went with him to the Mechanic Empire, as seemed to be the case, then this woman could take over the leadership of the Spiritual Church, as she was the leader of the most powerful faction in that organization now.

With Maximilian in the Spiritual World, no one would support an internal power struggle in the Church. But if he was gone, that would change, and Gloria had a good chance of taking over the organization.