{ The problem I can see with this theory is the fact that the Heart of the Black Garden existed. Even though it was separated from itself, it was still squirming, alive. It could even defend itself. It could be that for the Darkness to be truly destroyed, it must be wiped without a trace. If the Darkness truly was killed entirely, there would be no Ascendant Realm, no Heart, no “channeling” Darkness, no Taken. }
English
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The deep being only one being of darkness.
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<Like I said, if there's another source then it should be fine.>