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Veronica and Ervas explained everything they had to explain to Eustace and the other surviving Heroes.
They told them they were Anastacia, that Bestellen had tried to destroy their souls but only sliced it and both reincarnated in a mirror version of Kritias. After that, they gave a brief resume of how they grew stronger, up to this point.
This also included how they killed Hekaton and stole his powers, and used them to fight against the Super Bestellen of this Kritias, where they defeated it and also consumed it, acquiring all of his powers.
Of course, it was such a crazy story but… it made sense in the end, their power was beyond mere demon gods at this point, and the memories they held of the previous life as Veronica in Earth also matched…