Very interesting point. I too noticed the crystal is the one on the swords but Eris words when she picks up that Crystal does bring suspicion.
How can you prove Oryx has no tracking on those crystals and can use them to keep tabs on the guardians? All that killing with swords on the crucible is evil and may be feeding Oryx. :-)
English
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Oryx is dead. He was killed in the material world, which drove him back to his throne world, where he was killed again. He confirms that if he is killed in his throne world, he will die and his work will end.