Fixed Items: Fixed items are unique and powerful items that resist all attempts to enchant, socket or upgrade. Their resistance is so strong that they even resist the power of dragon balls!
      Many believe that their resistance is because of a strong sense of personality and stubbornness on the weapon's part. Such weapons have had a long history behind them and have an identity that prevents them from changing.

Where can I get Fixed Items: Bosses or quests can drop these items or grant you these items. Bosses include messengers, aids and kings. Lords can be bosses too sometimes.