in the first solo dungeon you do in neverwinter is called the hall of justice vaults.
in these vaults the first node you come across is a rogue node which is you can loot for free as a rogue it's the third group off in a dead-end
all you need to do is create a rogue any kind will be find kill your way to that node loot in and run back out in which reentering you'll reset the dungeon and you may procede to repeat it for crafting materials. my son go around I got an arcane crystal so the drop chances I don't know but it is possible to get blue quality crafting materials
hope this helps everyone with their crafting needs!