Wiseman Casian
Great. From now on, I shall let you know what is needed.
They are10 pieces of Ghoul's Skin, 12 bottles of Medusa's Blood, 5 bottles of Fettered Soul's ichor, and 5 Enhanced Gargoyle Nails.
You can get the Ghoul's Skin from Ghoul himself. He often appears in the execution place of Dion.
You can get the Medusa's Blood from the medusas that you can find in the northern part of Giran.
The Fettered Soul is said to show up frequently in the Death Pass.
Last, the Enhanced Gargoyle Nail... Among all the materials that you should find, this must be the hardest one. The Enhanced Gargoyle Nail are much stronger than any other creatures. I heard that they can be seen near the Ivory Tower of Oren.