Dragon Crystal (DC)
The Dragon Crystal is the best item to use to enchant your legendary (orange) equipment. It is currently the best enchanting matieral for Orange Equips (percentage wise)
Where can you find Dragon crystals?
It depends on luck (the drops of DC) but Psychodelica has the best chances (number wise, there are more bosses)
2. Fate Shop for 295 crystals each.
3. Events such as the Chamber of Fate.
4. Shops/trades? ;]