No Xur has never failed me because I'm pretty sure he takes the entire Destiny communities average RNG which isn't good and presents us with the mathematical gift that usually brings disappointment but Bungie loves to hold their secrets and best gear till the very end so I'm staying positive for the upcoming Xurmas where Bungie really shows their love and spirit of Christmas toward us
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They have the krampus spirit this year buddy, it may look like an exotic engram but I assure you it'll be a rare weapon or armor that you'll get out of it, logic of bungie
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