Magister Guyder:
In order to make a level 13 Soul Crystal into a level 14 Soul Crystal, you must defeat a monster with a strong spirit, such as Valakas, Antharas, Scarlet von Halisha or Baylor. However, unlike the spirits of Valakas, Antharas and Scarlet von Halisha, Baylor's spirit is difficult to absorb, potentially resulting in a cursed Soul Crystal. If that happens, you must journey to the legendary blacksmith Shaddai on Hellbound to get the curse lifted.
But I must warn you...
"Warn me about what?"