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Ervas and Veronica quickly entered the Divine Realm they found, which contained within the presence of two Demon Gods!
Without a doubt, these two were most likely Xorkoch ad Ullmarauth, the last Demon Gods within Seashore. No other Demon God could pop up out of nowhere, as Ervas and Veronica had the skies and even space itself around Seashore monitored by their powerful Senses, which had recently evolved into Divine Senses.
Nothing escaped their senses within a large radius, and the two quickly detected the Divine Realm and sneaked inside.
What they found inside was complete darkness inside.
Most Divine Realms in Kritias were like this, just empty spaces where Gods rested, there wasn't usually any need for anything fancy to be made into an illusion, such as trees or whatnot, as there wasn't any need for that, space was simply for the gods to stay.
Check "The Protagnist's Sister Is Actually the Strongest"!