Darci has been wildly unused since whisper of the worm dropped. with that whisper has still kept up with other great dps weapons and darci being a heavy sniper not being able to compete with the only other heavy sniper in the game, i think it would be a great idea to not buff darci but to make darci use special ammo instead of heavy. it would keep it inline with other special weapons for dps and make the use of the exotic sloght alot more worth it then having darci in the heavy slot.
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I heard...or well read in another persons post asking for a Darci buff that apparently Bungie has something planned for Darci also Darci wouldn't fit in the special slot either since the competition would outshine it in everyway except in pvp due to it's higher aim assist and the perk making that even stronger.