4-5 runs in a row we brought Crota to a no health state with 4 slams right before the oversoul killed everyone. I dont know but either Crota is a fireborn or this game is more broken than all of us in that raid thought. i have captures of the the many glitches we experienced over the last 5 hours of fruitless efforts due to bugs, bs, and Crota's new radiance abilities.
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Try ensuring the person who is handling the sword has host. That seems to reduce the amount of bugs and lag issues, although it won't make them go away entirely. Have whoever is going to run sword jump into the raid first with no other players in party. After he/she is loaded into the raid, everyone else can join on this. This will guarantee that swordbearer has host.
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Did you try throwing a suppressor grenade at him?