The answer has been given, it was a my fireteams mistake and not a bug. thankyou for the responses!
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You have to do constant sustained DPS to him while the blights are being detonated. The relic holder (and 6th person if there is one) need to be shooting oryx as the bombs are bring detonated or he will not take damage
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No bug. People died, and we're not shooting oryx. U also have zero finesse as a relic runner. It was a terribly sloppy unorganized display That's why the blights did no damage. Keep practicing
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Houston we have a PROBLEM!
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You weren't shooting him when the orbs detonated so he takes no damage. Have the person with the relic light (whatever it's called) just stand there and shoot.