My group (XMLG x Demon, MoMoGameFreak, Kryptek Cryo, RiZe Reign, Clawsnteeth, inSaneBrain23) found the most op strategy to killing oryx. Basically you need the minimum of 2 year 2 Celestial Nighthawks and 2 gunslinger hunters. This almost instantly stuns him if they both shoot him with the super then everyone else just has to shoot him with like primarys and that's it to stagger him. We had 3 so we would use 2 if we didn't have much time but 1 brings him down to half so if he hasn't slammed his hand yet and you have already killed the knight only 1 should shoot and everyone else should just snipe his chest and just cycle this but if you have all hunters and all celestial Nighthawks you can instantly stagger him every time just 2 people shoot him each time with the super and then the other people do it. But that's it for staggering all you really need is 2 gunslinger with the helmet and they can just take turns shooting him once but if you have more then it's easier. I hope this helps you guys as much as it helped us!
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If you jump on the pedestals in front of him you can do it with any of that. Just use primaries and shoot early enough. Dont wait for the white light, his chest starts to turn reddish.