Definitely either Oryx, who controls minds, or Atheon, who controls time
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kind of sad oryx is gone, not saying ghaul isn't legit, but he'll never be Oryx - i think atheon is second to oryx, if not first, we never got to really see him at full power, just trapped in his -blam!-ing vault
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There are other, much scarier gods than Oryx in the Destiny lore. Oryx was a badass, but there will be bigger badassery to defeat.