Sever doesn't reduce damage output in PvP like it is supposed to (intended to be 15% in PvP).
I also tested this myself in a private match. Seems to have broken with the Match 5th PvP changes.
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It still doesn't work and I'm not sure Bungie has ever acknowledged it. Very disappointing that its taking so long to fix.
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Tested further: no source of sever is working in PvP, tested threaded needle, titan strand melee, and slice and none of them are reducing damage output.