The Higher the Item, the better chance of success:

Item Upgrade Level Success Rate
4 ~ 6 ---------------------------- 50%
7 ~ 9 ---------------------------- 60%
10 ~ 13 -------------------------- 70%

Talk to the Chaos Goblin ( Noria )

Click the "Item option combination" button
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Place the level 380 item, 1 Jewel of Guardian and 1 Jewel of Harmony
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The option depends on the item
Press the "Combination" button
If the combination is successful, 2 item options are created on the item, if the combination fails only the Jewels are destroyed, the item is retained, you will not lose your item.
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Level 380 New item option (fixed)

Armor
SD Auto Recovery
Defense Success Rate increase +10 (PvP)

Pants
Defensive Skill +200 (PvP)
Defense Success Rate increase +10 (PvP)

Gloves
Max HP increase +200
Defense Success Rate increase +10 (PvP)

Boots
Max SD increase +700
Defense Success Rate increase +10 (PvP)

Helm
SD Recovery Rate increase +20
Defense Success Rate increase +10 (PvP)

Weapon
Additional Damage +200 (PvP)
Attack Success Rate increase +10 (PvP)