[VadeRetro]

The fusion process, if you are referring to the different identities of the ancient pantheon members, lies in the mind of Sitchin who states that all of the pantheons of antiquity were comprised of the same family members, the Nefilim, whose mortality stretched from millinia to millinia -- those who compared one of their years to 3,600 of our years due to the long orbit of their planet around our sun.

I'm glad to hear that was his mind, not yours!

[Eastbound]

Yes, the concept is difficult to grasp, let alone accept. But interesting nonetheless.