Items required
Windmill - 2
Regen Ring - 1
Force Armlet - 1
Energy Crystal - 2
Cost
1000 Gil
Damage Increase
+28 to base Str value
Where to find the items
Windmill
Either Mug high-level Thrustaevi or Card Mod Pandemona
Regen Ring
Defeat Toramas in the Esthar area
Force Armlet
With Familiar and Call Shop (Tonberry's abilities), buy the Force Armlet from the Esthar Pet Shop
Energy Crsytal
Energy Crsytals are hard to come by. To get them, fight Elnoyles, Behemoths or Ruby Dragons (high level)
Monsters -
Elnoyles: Must be at least level 40 to get 2 Energy Crystals
Behemoths: Must be around level 20 for 2 ECs or around level 30 for 3 ECs
Ruby Dragons: Must be high level to get ECs
Where to find the monsters -
Elnoyles: Lunatic Pandora, Esthar, Deep Sea Research Center
Behemoths: Tear's Point, Esthar, Deep Sea Research Center
Ruby Dragons: Island Closest to Hell, Deep Sea Research Center
Good Luck!