Hey guys, I am trying to farm some crystals from Guardians at the Flying Fortress in order to craft the Laser Sword and the Crystal Shield... It seems I already have a crystal from my Dungeon run when I bead Gun-D4M (Obvious refference to the Gundam anime...Nice job devs! XD). Does anyone know how to get crystals more easily? Because in my opinion they are quite rare drops! Thanks!