How to get Osteo Striga in Destiny 2

There's been some confusion about how to get Osteo Striga in Destiny 2, depending on which version of the Witch Queen expansion you bought. The Savathȗn-starring expansion is finally here, though, and with it comes a new campaign, harder difficulty, and the long-awaited addition of weapon crafting. It also offers a new exotic you can unlock relatively quickly, but there's a catch...
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