Odin had reigned supreme in the universe before the queen was established and his only purpose in living inside the universe was to nurture warriors that could become celestials and challenge his master for a fight.
Every celestial had the right to appoint ONE soulmancer as their representative to the universe and the job of these soulmancers was to be the arms and legs of their master and fulfil their wishes in the universe.
For the perfect warrior, this individual was Odin and the only instruction that he had given Odin was to find and nurture talents that could someday defeat him.
It was for this sole reason that Odin reincarnated several souls and guided them to become powerhouses from the shadows, as he desperately hoped that someday, someone amongst those could become a warrior supreme and give his TRUE master a fight that he so desperately craved.