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Ervas and Veronica revealed to everyone that the bodies they were showing were mere Phantom Clones made inside their Divine Realms and that the real ones were evolving alongside their souls.
In simple terms, their consciousness was split through parallel minds, and the ones they were speaking with were parallel minds, while the main bodies were evolving and delving into the powers acquired from Hekaton, a God that could be cataloged to be even stronger than Bestellen in terms of energy quantities, accumulated knowledge, and expertise on his field.
He was only killed so easily because he was a God that didn't fight, he was created to do a single task, and although he accumulated a lot of power, he was still lacking in the terms of battle, but incredibly talented in his own field of expertise like nobody else.