Lucas had followed him when he had decided to leave and it was at that moment that he had presented himself to them.
When a God disappeared, the Creator would psychically send him a list of candidates to replace him and it was up to him to make the final choice, and this time he hadn't hesitated for a second to choose Mykael.
It had taken him months of patience to convince him to become the God of Destruction, and he had to take them both to worlds that were on the verge of destroying themselves, and thus to destroy the other worlds around them, before Mykael finally accepted his offer.
It was the first time that a human had resisted him so much, usually they were all rather eager to become a God but not him, and it was also for that reason that he had persisted because he was sure that Mykael was the perfect man to become in some way the Guardian of worlds.