To create Awakening items you need:
A sealed item specifically for your class, the item will indicate which class it is worn on
Next you need to find a chaos goblin (Lorencia 142x115 or Noria 179x102), open it and click Regular Combination
and insert the weapon you need here along with Ancient Hero's Soul
Unsealing an item has a 100% chance and the item does not burn, and you will receive an Awakening weapon