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I'm getting a strong "moon" vibe. Pre-collapse, we had a large amount of power situated there. However, with the onset of the hive's great conquest, it has been reduced to nothing. Millions of guardians were killed in Crota's attack, but leaving no bodies behind. However, much of our old destroyed moon bases remain, empty. What evil lurks within me? The dark below. The Hellmouth is crawling with all kinds of evil spawn, like Phogoth, who is the closest I come to reconciling my moon theory with the bonds part. In conclusion: I say it's the Moon.