I started playing destiny at the start of year 2, and after doing some research realized that certain grimoire cards unlock specifications can not be met (Dark Below Urn of Sacrifice).
Since the quest is initiated via Eris' bounties which no longer are available, is there a way to complete the grimiore?
Or am I simply missing some thing that unlocks it?
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Try buying legacy engrams from Xur. They give you year one weapons. Almost all of the year 1 armor was brought to year 2 by your choice of Legendary Marks.