You buy something from xür only to have it drop from an engram that same day.
English
#Destiny
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I bought ruin wings and then I bought a gauntlet engram. Decrypted the engram and guess what? Ruin wings with a worse stat roll. So basically 23 motes of light for an exotic shard [spoiler]Just kidding. But I'm sure this happened to someone[/spoiler]