| Name | KR Name | Group | Description |
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| Ithildin Ore | 이실딘 광석 | Material | During the kingdom's founding period, it used to be a precious metal that could only be mined with the guidance of the goddess. Nowadays, it is more common. |
| Ivory Pendant | 아이보리 팬던트 | Armor | Something among the goods containing the magic crafted with the pure magic not the goddess' blessing. This necklace is a typical sample of them. |
| Jack-O-Lantern Hair Ornament | 잭오랜턴 헤어장식 | Armor | A reward for the Halloween event. It is said to be made out of pumpkin. |
| Jevenellis Leather Armor | 제베넬리스 레더 아머 | Armor | A top made from a special ivy. They are environmentally friendly. |
| Jonas' Record | 요나스의 기록 | Quest | An archive that Jonas devoted his lifetime to create. Readable. |
| Jukopus Core | 유코푸스의 핵 | Quest | The core of a Jukopus, requested by the Archer Master. |
| Jukotail Ore | 유코테일 광석 | Material | Ore created from the petrifaction of the fruit that hangs from the tip of Jukotails' tails.
Obtained from Jukotails. |
| Junior Mercenary Costume (Female) | 하급 용병 코스튬(여) | Premium | The basic uniform given to low-rank mercenaries. Use to change your appearance. |
| Junior Mercenary Costume (Male) | 하급 용병 코스튬(남) | Premium | The basic uniform given to low-rank mercenaries. Use to change your appearance. |
| Jurus' Accessories | 악세서리 상인 유르스의 악세서리 가방 | Quest | A bag with accessories made by Accessory Merchant Jurus. |
| Kalejimas Teleport Magic Scroll | 칼레이마스 공간이동 주문서 | Quest | A teleportation scroll that can only be used in Kalejimas Prison. |
| Kateen Flower Decoration | 카틴 꽃 장식 | Armor | Headband made with flowers from the Kateen Forest. It emanates a faint blue light. |
| Kaulas Leather Armor | 카울라스 레더 아머 | Armor | A strong piece of armor made of monster leather and bones. Rumor has it warriors from faraway countries adorned their armor with large bones to represent their skill. |
| Kedoran Alliance Detector | 케도라 상단의 탐지기 | Quest | Detector used for searching items on the upper shelf. |
| Kedoran Merchant Alliance Educational Material | 케도라 상단의 신입 교육 자료 | Quest | A guidebook used to teach new members of the Kedoran Merchant Alliance. It is written in monster blood ink. |
| Kedoran Merchant Alliance Scroll | 케도라 상단의 스크롤 | Quest | A scroll thats provides you the benefits of the Kedoran Merchant Alliance. |
| Keista Restoration Potion Lv1 | 케이스타스 회복포션Lv1 | Drug | Restores your HP and SP by 373 every 2 seconds for 15 seconds. Right-click to use. Cooldown of 100 seconds. |
| Keista Restoration Potion Lv2 | 케이스타스 회복포션Lv2 | Drug | Restores your HP and SP by 480 every 2 seconds for 15 seconds. Right-click to use. Cooldown of 100 seconds. |
| Keista Restoration Potion Lv2 | 케이스타스 회복포션Lv2 | Drug | Restores your HP and SP by 480 every 2 seconds for 15 seconds. Right-click to use. Cooldown of 100 seconds. |
| Keista Restoration Potion Lv3 | 케이스타스 회복포션Lv3 | Drug | Restores your HP and SP by 617 every 2 seconds for 15 seconds. Right-click to use. Cooldown of 100 seconds. |
| Keista Restoration Potion Lv4 | 케이스타스 회복포션Lv4 | Drug | Restores your HP and SP by 831 every 2 seconds for 15 seconds. Right-click to use. Cooldown of 100 seconds. |
| Keyarc Leather Armor | 키아크 레더 아머 | Armor | Keyarc equipment was once once amongst the most popular items made by the Kedoran Alliance. After Medzio Diena, the Alliance is once again selling this equipment, although it is unsure how much profit it can yield given that they are now being produced by other organizations as well. |
| Khasti Two-handed Sword | 카스티 투 핸드 소드 | Weapon | The unusual fan-shaped blade offers potential to amplify its power and versatility to be adapted in many techniques. |
| King's Plateau Report | 왕의 고원 결과 보고서 | Quest | A Disease Detector report the Plague Doctor Master has asked for. |
| Kite Moor Bracelet | 카이트 무어 브레이슬릿 | Armor | This bracelet was made to help sacrifice the last elements maintaining the wearer's life to allow them to deliver one ultimately powerful blow. It all depends on whether the wearer's resistance is higher than the enemy's. |