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Unusual mix of an adventure and an idle-game.
Play as a lonely Shade, the last servant of a king who once ruled an underground kingdom. The king's powers have faded and he falls asleep for 400 days to regain his might. It is your duty to stay in the earthen palace until he awakens.
As soon as you start, the game inevitably counts down the 400 days - even when you stop playing and exit the game.
It is now up to you to decide what to do with your solitary existence beneath the soil. Don't stress yourself, you have plenty of time.