This is probably the worst exotic mission we had in a while. Too many adds, no checkpoints, set power level, catalyst is awful for an awful glaive. And you need to complete the mission on legendary for the seal. Seriously bungie you need rework this mission.
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Try the Hunter build with Assassins Cowl, Malfeasance, arc heavy MG and special of your choice. Oh, and if using LFG and someone is running double primary, GTF out 👍