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We spent a few hours in the castle preparing everything, with the guidance of the Great Dragons, we made a comfortable and big nest using a variety of sticks, grasses, and even flowers, and also fire spirit stones we mined underground, which kept the nest warm. The nest was placed in a big empty room in my castle, where there was a large window that gave the eggs all the sunlight they could get in the day and the moonlight in the night.
According to the Red Dragon Queen, the most motherly of the four, Great Dragon Eggs need to feed on Sunlight and Moonlight every day and night to grow healthy, no matter what kind of dragon they were. Apparently their incubation could take a lot, depending in the system that "created" these eggs, so we don't know if they'll hatch soon or very late, it'll all be left to luck, most likely.
Check "The Protagnist's Sister Is Actually the Strongest"!