If he is killed, he will respawn in his throne world. Read up on the books of sorrow grimoire.
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Then just warp him out of existence in his throne room, or just freeze him in time.
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Either way, Oryx wont leave the dreadnaught and can send shades of himself to take those enemies for him. He wouldnt have to do anything at all except send shades. He could take anything not forged in light, so he would literally just take every single thing in the Halo universe.
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If Oryx could take everything without light, he could have taken all of the other factions troops, yet he didn't. So I'm not buying that.
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A throne world is a place that only the creator or whatever it is called can control whatever the hell he feels like unless it's tainted with light but master chief og as -blam!- so idk
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He can literally just take them if he wanted to, too.