Hidden Enchanthttps://irowiki.org/wiki/Hidden_Enchant

The Hidden Enchant is one of many Enchantment features present in Ragnarok Online used to improve equipment, specifically armor. Only some armors can be enhanced by this system.

The Hidden Enchantment NPC can add special stat bonuses to different armors. Unlike the regular Socket Enchant NPC, the equipment is randomly given an increase of between 1 and 3 of one of the six Main Stats. The NPC is located near the south gate of Prontera (prontera 165/60)Paste Ingame. Each attempt costs 400,000 zeny; 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.

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.

If the player possesses an unupgraded, uncarded, unslotted, unenchanted armor and wants 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. Once successful, a card may then be attached to it. This ensures no benefits and bonuses are lost along the way (assuming each step is successful).

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

Armor	Unslotted	Slotted	High-Grade
Mantle	Yes	Yes	No
Coat	Yes	Yes	No
Chain Mail	Yes	Yes	No
Full Plate	Yes	Yes	No
Silk Robe	Yes	Yes	No
Saint Robe	Yes	Yes	No
Tights	Yes	Yes	No
Silver Robe	Yes	Yes	No
Thief Clothes	Yes	Yes	No
Ninja Suit	Yes	No	No
Legion Full Plate	Yes	Yes	No
Holy Robe	Yes	No	No
Wooden Mail	Yes	No	No
Mage Coat	Yes	No	No
Chameleon Armor	Yes	N/A	No
Glorious Suit	Yes	N/A	No
Glorious Popularized Suit	Yes	N/A	No
Glorious Mass-Production Suit	Yes	N/A	No
Mink Coat	N/A	Yes	No
Lord Clothes	N/A	Yes	No
Glittering Jacket	N/A	Yes	No
Formal Suit	N/A	Yes	No
Scapulare	No	Yes	No
Lucius's Fierce Armor of Volcano	Yes	Yes	No
Saphien's Armor of Ocean	Yes	Yes	No
Aebeecee's Raging Typhoon Armor	Yes	Yes	No
Claytos Cracking Earth Armor	Yes	Yes	No
Meteo Plate Armor	N/A	Yes	Yes
Orleans's Gown	N/A	Yes	Yes
Diabolus Robe	N/A	Yes	Yes
Diabolus Armor	N/A	Yes	Yes
Assaulter Plate	N/A	Yes	Yes
Elite Engineer Armor	N/A	Yes	Yes
Assassin Robe	N/A	Yes	Yes
Warlock's Battle Robe	N/A	Yes	Yes
Medic's Robe	N/A	Yes	Yes
Elite Archer Suit	N/A	Yes	Yes
Elite Shooter Suit	N/A	Yes	Yes
Sprint Mail	N/A	Yes	Yes
Kandura	N/A	Yes	Yes
Armor of Naga	N/A	Yes	Yes
Improved Tights	N/A	Yes	Yes
Life Link	N/A	Yes	Yes

Armor	Unslotted	Slotted	High-Grade
Angelic Protection	N/A	Yes	No
Novice Breastplate	N/A	Yes	No
Valkyrian Armor	N/A	Yes	Yes