My personal belief is that oryx is still alive and he could be the one pulling the strings and contacting uldren
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Well if you saw when Ghaul became a big cloud thing, if you look slow motion when he is opening his wings.. he looks just like Oryx.. I totally was like (during this part) Oh shit it's Oryx! And then it finished and it was Ghaul.. Would've been awesome of Ghaul had become posessed by Oryx and that lead him to come and attack us, only by joining with the light and dying he became his Final Form.