Upgrade Cores are a type of Core used for increasing stats on armor and weapons. The +X after the name of an item indicates how many times it was successfully upgraded. Eg, "Titanium Blade +4" has been upgraded 4 times.

If you've never used an Upgrade Core before, you are best to practice with an Upgrade Core(Low). Be aware that the stat requirements of the item will increase when you upgrade it.

1.Un-equip the item you are upgrading
2.Right click on the Upgrade Core
3.Left click on the item you are upgrading
4.If successful, the item will now be +1 (or more depending on the original grade of the item), in a very few situations, the item is upgradet with +2

There are 4 grades of Upgrade Cores:

1.Upgrade Core(Low): Upgrades any equipment lower than Bluestin. This includes Training, Normal , Reinforced, Silk, Iron, Damascus, Aramid, Shadowsteel, Crude, Red, Coraleye, and Citrine items.
2.Upgrade Core(Medium): Upgrades any equipment lower than ShadowTitanium. This includes Bluestin, Titanium, Shadowsteel, and Pherystin items.
3.Upgrade Core(High): Upgrades any equipment lower than Forcium. This includes Shadowtitanium, Osmium, Red Osmium, Aqua, Lapis, Topaz, Mystic, Terragrace, Shineguard, and SIG Metal items.
4.Upgrade Core(Highest): The only core that can be used to upgrade Forcium/Mithrill grade equipment.

When you attempt an upgrade, there is a chance of failure. The chance of failure increases the higher the item grade.

Be very sure of your decision when upgrading to the +8 and +9 ranks!!

NOTE: From the last update we can upgrade items to +12, but still we dont have the success rate and the starts it gives after +9. When we find proper info we will add it to the topic!