Don't complete it until the DLC releases!!
Planet Destiny confirmed that when you turn in an exotic bounty after the release you will receive the version 2.0 of that weapon!!
You won't need to waste your shards to upgrade it!
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No worries my thorn 500 void kills & invective bounty been catching dust For about 2 weeks now think. I suck at pvp for the most part If it was for an icebreaker oh ghorn then I would of grind it out asap.