Thorn should be available for purchase from the kiosk, for the guardians who completed the Year 1 Thorn Exotic Bounty.
Year 1 Veterans deserve it.
Why do again a quest for a gun that I already obtained through a difficult bounty?
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Because [spoiler]everyone who had the bounty got it when ttk dropped People got it from the strange engram when ttk dropped During ttk you could get it from legacy engrams[/spoiler]you probably didn't even complete the bounty