Morpheus originally thought it would be better to separate from Aureus.
Though his nephew was young, he was no fool, and certain actions of his would certainly raise suspicion. However, he realized his line of thinking was funny. So what if he was suspicious? The truth would be revealed after his death.
With that kind of mindset, Morpheus introduced the significance of Spirit Circle to the young eagle. Spirit Circle was one of the sacred places within Agartha, a place no one could enter easily.
Morpheus thought this was a good opportunity to let his nephew meet the most senior witches in the kingdom.
'With them acquainted, Aureus will have the best teachers supplying his lack of basic magic knowledge.'
Upon entering the Spirit Circle, Morpheus immediately put his plan to action, separating Thala Grimsbane from her sisters.