Correction, the Rings were meant to kill all sentient life thus starving the flood by denying them any hosts to infect. Oryx is classified as sentient life.
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But oryx is a God and can travel to and from a type of spirit world
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Ok, then what about Tolan the Shattered saying the Hive were immortal? From the mission where you're trapped in the pit, running from the Ogre?