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As it turns out, the Unstable Heavenly Domain was once a piece of the Origin Heaven Continent...
It was torn off by accident. What accident exactly was never recorded anywhere. But rumor said that instead of repairing it, the managers of this place instead used it as a tool to scan and filter creatures who are talented enough to come here.
They tore the realm into fragments and scattered it across the Primitive Universe. They made it so that only three fragments will be present and interactable at once; others will remain dormant while there are already three active. Like they have a rotational schedule.
And only one of the three active fragments will appear in the five known Chaos Realms.
