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Gods are an odd concept when talking about multiverses or how to connect Minecraft-Smp's into one cannon.
But what if they all existed, and not in a way that makes two different gods the same. What if they all existed in their own hierarchy?
The more Smp's a god has control of and can effect with their magic/powers the higher in this hierarchy they are.
So DreamXD would be a lower ranking god since he only effects the DreamSmp, same with Aeor and Exor.
The Watchers would help the gods, they care for the Smp's and make sure everything is going well.