365 Fatebringer!!
Edit: the nightfall this week is Archon Priest w/ Solar/Arc Burn Primary weapon boost and also a lot of fun. Also for future reference on the app you can check the daily and weekly activities amongst other useful stats.
Final Edit: BUNGIE PLEASE REMOVE FINAL ROUND FROM SNIPERS!!!! completely ruins the game
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... or you could just run the standard VoC/Gjallarhorn combo. Pretty sure three 365 Gjallarhorns will end the boss quicker than three 365 Fatebringers...