I think Xür should sell exotic shards again as I've been running quite low recently.
If we can get this trending maybe Bungie will see it and get it changed!
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If you are running low, buy a few exotic swords from the blueprint kiosk and max them out with motes. Cost a little glimmer and 1 shard to buy and you will get 2 shards back most of the time from dismantling them. They max out really quick and there are fewer nodes to waste materials on compared to weapons. I'm sure there are better ways but this could help u out for now.