Final encounter is bugged. After defeating nightmare Caitl boss in the nightmare realm, the animation to transport the fireteam back to the normal realm bugs out and it just flashes the green aura effect continuous with the sound queue...like we are caught in a loop. So we can't get the final chest. Happened twice in a row. Please fix asap. Still don't have the exotic sword.
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Loot will be in your postmaster. The chest opens on completing the kill of caitl. You don‘t need to open it yourself by interacting. Its open on completion.