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| Name | Type | Slots | Level | Description |
| Oak Blocks | | | 0 | Wooden blocks, pulleys, and other rigging equipment used to manage a ship's rig. |
| Obsidian Blade | | | 0 | A ceremonial knife blade chipped from black volcanic glass. |
| Obsidian Eagle | | | 0 | A delicate figurine of a soaring eagle carved from obsidian. |
| Obsidian Earrings | | | 0 | These earrings are arcs of polished stone with obsidian fragments attached. |
| Obsidian Jaguar | | | 0 | A firurine of a hunting jaguar in obsidian. |
| Obsidian Pendant | | | 0 | An intricately carved medallion of obsidian on a leather strap. |
| Odysseus' Cannon Modification 1 | Cannon Modification | | 15 | Rope, blocks and wedges allow for fast and precise cannon aiming. Named after the hero of Homer's epic "The Odyssey". |
| Of the Mysterie of Vintners | Recipe Book | | 0 | An unsigned work on the vintner's craft, and fine foods to accompany their wines. |
| Ogoun's Liquid Courage | | | | Makes you Powerful! And just a bit tipsy. |
| Ogoun's Liquid Courage | | | 0 | Makes you Powerful! And just a bit tipsy. |
| Old Masterpiece Small Sword | | Main Hand | 0 | A Small Sword of superb quality. |
| Old Superior Cutlass | | Main Hand | 0 | A Cutlass of superior quality. |
| Old Superior Rapier | | Main Hand | 0 | A Rapier of superior quality. |
| Optimized Rigging 1 | Rigging | | 10 | Optimize your rigging for performance and ease of use at low speeds. |
| Ore, Copper | | | 0 | Unsmelted copper ore. Raw ore must be heated to high temperatures to generate useful copper ingots. |
| Ore, Gold | | | 0 | Unsmelted gold ore. Raw ore must be heated to high temperatures to generate useful copper ingots. |
| Ore, Iron | | | 0 | Unsmelted iron ore. Raw ore must be heated to high temperatures to generate useful copper ingots. |
| Ore, Silver | | | 0 | Unsmelted silver ore. Raw ore must be heated to high temperatures to generate useful copper ingots. |
| Ore, Zinc | | | 0 | Unsmelted zinc ore. Raw ore must be heated to high temperatures to generate useful copper ingots. |
| Overloaded Cannons 1 | Cannon Modification | | 15 | Cannons built to be overloaded, thereby dealing more damage but at the cost of your crew's safety. |
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