Aaron summons the power that was given to him by his ancestor, the God of space and passage.
His family gained the blessings that came from him. Although he simply adores his human descendants, that is why he gave them a fragment of his power. The authority of space and passage. Though to use such authority they must be within their capabilities and favouritism of God.
Fortunately, all the five Gods favor their descendants and that is why when they saw such a slaughter, they wanted to make their own move despite the rules that hindered them. It was still their children, their kin to the human they fell in love with. Seeing them dying one by one almost made the Gods berserk. They watched them from when they were born, until they became adults, and had a family and grandchildren. That is why they can't explain the rage they felt.