What about a Light Tian? Has anyone considered that if the Void can corrupt a Titan, why can't the light seeing as its the opposite of the void? Maybe that's the secret agenda of the Light based forces like the Naaru?
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Maybe there are Light lords that also can manifest in the Physical Universe, so they fling Naaru/something else we haven't encountered yet to combat the void/ "Purify"/corrupt a Titan.