Scrolls to upgrade items are; Upgrading Scroll, Purification Scroll and Rare Upgrading Scroll. If you upgrade an item using Upgrading Scroll, the item's upgrade level will increase by +1. On the other hand, Purification Scroll will decrease the item's upgrade level by -1. Rare Upgrading Scroll will increase the item's upgrade level by +1~+3 in random. Upgrading Scroll can be purchase from the Consumable Supplies Merchant located in the Starting village and the Capital Castle or obtain through hunting Named Monsters. Purification Scroll can be made by craft system.
(Rare Upgrading Scroll is a 4 story gold Item.)

Item upgrade is the system that upgrades the ability of Weapons and Armors. Items can be upgraded up to maximum of +20, however, keep in mind that as the level increases, the success rate decreases. Also, different visual is applied on items depending on upgrade level. Upgrade of items can be done from the NPCs in charge of Upgrades. 

[Upgrade Enginner]Luji in Lonbarei Training camp in Horusland and [Upgrade Engineer]Titina in Magnaksia Military District in Kether, are located in DeFugel. [Skill Supervisor]Purel in Kuznets Advance base in Yesod and [Senior Blacksmith]Boyd and Malkuth, are located in Croxion.

Double click with left button on the mouse or right click on the mouse on the NPC and click on Enchant, then item enchant window will appear on the screen.
Place an item that needs to be upgraded in the slot of enchant item, and place the scroll in the scroll slot.