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I don't want to be the one, be the one who has the sun's blood on my hands,
I'll tell the moon, take this weapon forged in darkness,
Some see a pen, I see a harpoon
When I think about these verses, I think about the "Sun" being happiness and the "Moon" being the opposite. When I read this, I see the narrator refusing to write about happy and upbeat issues, pretending things are all good, because he doesn't want people getting false hope, but rather approaching it from a different angle so that he can safely grant hope in a different way. If he gives false hope, happiness (or the sun), in a sense, dies. So, the narrator asks the moon to take control of his pen, which he uses as a weapon against the demons of others and the demons within himself.