If you get your hand on Essence items, you are able to go to a Wheel of Fate and roll for weapons, armor, soul shield and more. To spin the wheel go to it and press F to spin. If you get locked weapons which are not for your class remember you can use them to upgrade your weapon. Spare Soul Shields can be salvaged into Broken Parts that can be sold to vendor or fusion powder used later.
You can roll as long as you have Essence items.
I will be playing a Destroyer on Hao District EU as Mithrie. If you want to join me and the viewers in game message me if you see me online. To join the RWBY clan message Mithrie, Naraku, Nitori or Younmi in game for an invite.