"Did you absorb all the powers of the cultists as well as that stronger one?"
"Yes. I mean, I absorbed more than just their powers. The prime cultist gave up everything that it had."
Since the prime cultist signed the contract of Origin to hand over everything that it possessed, there was nothing on it when it vanished from this world.
Everything that belonged to it now belonged to Rain. Including the artifacts, the energy, the memories, the existential values, the achievements, the points that it possessed– apparently it had a good bunch of them– and it also possessed a vast amount of energy alongside these things.
"While the energies that they possessed were corrupt, I can still collect them and store them in my core. There, my purer energies will wash them up and incorporate them all into my own."
While I have eaten a good feast, I will need a little longer to digest these things.