| Name | KR Name | Group | Description |
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| Opinion about the Nheto Forest Painting | 네토 숲의 단풍화에 대한 소견서 | Book | Opinion about the Nheto Forest Paintings written by Chronomancer Master Lucid Winterspoon. Right-click to read. |
| Oracle Costume | 오라클 코스튬 | Armor | Soft and light, this costume is said to comfort and calm your body and soul. |
| Oracle Master's Note | 오라클 마스터의 쪽지 | Quest | A note containing the location of the Pied Piper Master.
The Oracle Master's advice was to write down the list of tasks that you will be given once you meet the Pied Piper Master in this note. |
| Orange Cat Ears | 주황색 고양이 귀 | Armor | This will gain you affection from a certain animal. |
| Orange Contact Lenses | 오렌지색 렌즈 | Armor | Colored contact lenses can alter the color of your eyes. |
| Orange Grummer Antenna | 주황 그루머의 더듬이 | Material | Material obtained from monsters.
Used for crafting. |
| Orange Rabbit Ears | 주황색 토끼 귀 | Armor | Connoisseurs often get into disputes regarding the cuteness factor of a straight ear versus a folded ear. |
| Orange Tama Gem | 주황 타마의 젬 | | A gem that can be found in a dungeon. It is able to enhance equipment by equipping it in a socket. Cannot be used with same effect simultaneously. Right-click to insert it to an equipment. |
| Orb Crystal | 보주 결정 | Quest | Said to turn into a Holy Stone when gathered in large quantities. |
| Orb Fragment | 구슬 조각 | Quest | A sparkly orb fragment found at the Evacuation Residential District. |
| Orb imbued with Aura | 영기를 담는 보주 | Quest | The bead that could accumulate the spiritual power. You could either accumulate the spiritual power or pull it out based on how you use it. |
| Orb imbued with Aura | 영기를 담는 보주 | Quest | The bead that could accumulate the spiritual power. You could either accumulate the spiritual power or pull it out based on how you use it. |
| Orb of Comfort | 위로의 구슬 | Quest | An orb prepared by the Bokor Master in order to soothe the souls of the unjustly slain people of the town of Andale. |
| Orb of Divine Detection | 신성력 탐지 구슬 | Quest | An Orb of Divine Detection crafted by the Kupole. It will react to any divine energy in the area. |
| Orb of Divine Detection | 성력 탐지 구슬 | Quest | An orb that can detect holy power.
It can help the user find the Graceful Relic. |
| Orb of Nostalgia | 망향의 구슬 | Quest | A jewel that instantly teleports you to a saved location.
Cooldown of 15 minutes |
| Orb of Provocation | 도발용 보주 | Quest | An orb with exceptional quality useful for taunting enemies. |
| Orb of Purification | 정화의 보주 | Quest | Orb used to purify demonic energy. |
| Orb of Return | 환원의 보주 | Quest | An orb that can destroy the Cursed Idol. You can absorb magical energy into the orb by defeating the demons. |
| Orb Recorder of Past Memories | 과거의 기억을 기록하는 보주 | Quest | A mysterious orb that is able to read the owner's past memories. |
| Order to defeat the Demons | 마족 처단 명령서 | Book | An order made at Vakarine's command. Read what's inside. |
| Order's Secret Medicine | 교단의 비약 | Quest | Medicine created by Brutus from the Order of the Tree of Truth. Nobody knows what it is created from. |
| Ore Collection | 광석 콜렉션 | Collection | A collection where you can register your items.
You can register an item by right-clicking it. |
| Ore Crystal | 광석 결정 | Quest | A chunk of metal consolidated inside a monster. |
| Organic Solvent | 유기용제 | Quest | Potion used to remove dye. Morkus wishes to spray this on a green tree. |