No, not actually.
When we fougth him, he absorbed a lot of Light by force from the Traveler. When we killed him, that Light probably gave him a sort of "Sunsinger" moment. That's all...
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Maybe thats why we cant self res anymore, because he stole all the juice
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If you mean that we lose our power, that is because he imprisoned the Traveler with a sort of Suppression Cage that block the Light irradiance from the Traveler. If you mean that we can't self-res when we fight him, that is only game mechanics...