Answer:
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.
A word I know, six letters it contains. Subtract just one and twelve remains.
A skin have I, more eyes than one. I can be very nice when I am done.
At night I come without being fetched. By day I am lost without being stolen.
A morbidly-named body of water
i'm popular for Knuzlocks what am i
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What am I?