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Losing Acala as Prime Earth's spiritual consciousness should've originally caused a decline. Without her, luck wouldn't truly favor humans, which will hinder their development. It was for this very reason that the Demon Race wanted to capture her alive.
But the current scenario wasn't a horrible thing. Acala didn't die; she evolved and ascended to a cosmic spirit. Prime Earth might've lost her, but it doesn't mean that she abandoned it and its citizens.
Turning into the spiritual consciousness of Solaris Prime not only elevated Acala's power and domain; it also added more abilities to her, making her more versatile. However, as a spiritual consciousness, all of her abilities lie in nurturing her 'physical form.' Solaris Prime was just as much of a prison to her as it is a garden.
