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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365 Fatebringer and 365 Gjallarhorn. Doesn't even matter what the special weapon is, but probably either Longbow Synthesis (arc) or Efrideets Spear (Solar). It's really a win win.