Who is the Unknown God in Genshin Impact?
Who is the Unknown God?
At this point, there is little known about this god. She called herself the 'Sustainer of Heavenly Principles' and separated our player characters from their siblings. Her abilities include portals and control over boxy particles that can seemingly absorb energy to be used elsewhere or trap beings inside it.
Moving on to speculation, many believe she is the 'leader' of the gods of Celestia. From images of what befell the ancient city of Khaenri'ah, it is her wrath that brought the civilization's downfall. One thing we know about the Calamity was that the city angered the gods, and that was the direct reason for its destruction.
We can see the identical boxy particles in the glimpses of that ruination, so it's safe to say that the Sustainer is part of that pantheon. Still, the game is barely a year old for now. We don't have all the puzzle pieces yet, and it's useless to speculate too much.