Items required
Adamantine - 1
Dragon Skin - 4
Fury Fragment - 1
Cost
800 Gil
Damage Increase
+25 to base Str value
Where to find the items
Adamantine
Easy to get:
1) Mug the boss at FH
2) Refine 10 from Minotaur's card using Quezacotl's Card Mod
3) On Long Horn Island, there are usually Adamantoise that drop Adamantines
Fury Fragment
Fury Fragments are obtained by modding several Blue Dragons using Quezacotl's Card Mod, or fighting lower level Ruby Dragons
Dragon Skin
These can be obtained by card modding Grendels or by defeating high level Anacondaurs
Good Luck!