So. Theoretically if the guardian could control resonance. Couldn’t they enact the final shape? I mean. Confine resonance, stasis, and strand and that’s what the witness was doing for the final shape. Strand is the strings of reality, use strand to effect the universe. Stasis freezes stuff, which is what the final shape did, freeze everything in place, and resonance would create the weird moulds and the duplicated versions of things. So really, combining all of these together, the guardian could enact the final shape
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Well Darkness power was only part of it. You need control of Light to reshape reality. The whole Witness thing was drummed up last minute. Heck they even admitted there wasn’t any real Darkness to begin with when D2 dropped. That’s why there’s no hint of him ever in the lore until he just shows up. The whole end game was a retcon. Which is why it’s weirdly convoluted and silly.