>buys voidfang vestments from xur
>buys exotic chest engram from xur
>gets voidfang vestments from cryptarch
>Thx xur
>Thx cryptarch
>quits game
-
Hah ouch that sucks, but really you should always decrypt engrams before buying gear (especially purple engrams). Unfortunately you learned a hard lesson. Just look at it like this- instead of 7 strange coins, you bought an exotic shard for 23 Motes.