I'm halfway through MyName is Byf's "The Complete Story of Destiny". He just explained what happened at Twilight Gap and why the Gjallarhorn was created in the first place. Not having it in Destiny 2 is tantamount to Bungie saying f*** the Lore. Which is very sad because this lore is totally f****** awesome!
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Specially for those of us real veteran players of the first game that earned it the first time around. It should have been brought back both with the original quest and for those that earned it ... it should be available direct from collection