The Hidden Enchantment NPCs can add special stat bonuses to different armors. Unlike the regular socket_enchant NPC, the gear is randomly given +1 ~ +10 of one of the 6 stats. The NPCs are located near the south gate of Prontera (165, 60). When enchanting an armor, all previous enchantments, upgrades, and cards are lost. There is a chance of failure, in which case the item is destroyed. No other items (other than the actual armor) are required. An already-enchanted armor can be enchanted again, but will lose any bonuses, upgrades, cards, etc.

If you have an unupgraded, uncarded, unslotted, unenchanted armor and want a slotted-enchanted-upgraded version, (if it's slottable/upgradeable) it is necessary to first slot it with the socket_enchant NPC, then use the Hidden Enchant NPC to add stat bonuses, then upgrade. After all that, a card may then be added to it. This ensures no upgrades/cards/slots/stat bonuses are lost along the way (assuming each step is successful).

• Apprentice Craftsman (Gives items +1~+3 of a random stat, not 100% chance; see below.)
• Experienced Craftsman (Gives items +4~+6 of a random stat, not 100% chance; see below.)
• Expert Craftsman (Gives items +7~+9 of a random stat, not 100% chance; see below.)
• Master Craftsman (Gives items +10 of a random stat, not 100% chance; see below.)

The chance of success varies depending on the class of armor.