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Like this, Nepheline and Shade shared various things about the outside world to the couple and their child, from the various continents, the countries, the current political strife between these countries, the problems with the Demon Continent and the battles going on in here, and more.
They also talked about the Demon King and such things these people had no idea about at all, they either always lived isolated lives underwater and never interacted with what was happening outside or existed in a time before the demon king appeared.
Shade and Nepheline were well aware that the World of Terrarium already hosted life on its own even before the Gods appeared. Beings such as the Spirit King and Queen, the Dragon King, and Yggdrasil, existed even before the Demon King appeared to defend the planet.