Mysterious Scrollx10
Normal
When you drag this Scroll to an Equipment Item, you can upgrade that Item and give it an option.
[Apply grade]
Rare, Epic, Unique
[Acquisition]
Boss monster after 31F of Tower of challenge
Horoll's Craft Box
Booty of Tower
Available in the Shop
[You can't give an option to Normal grade item but can try to upgrate to 'Rare' grade]
HuyYuh