| Name | Level | Type | Boss | Damage Type | Resistances |
|---|---|---|---|---|---|
| Oak Rot | 94 | No | 50% Nature | ||
| Ocean Crab | 71 | Sea Creature | No | Pierce | -10% Pierce 30% Arrow 20% Soul 100% Disease |
| Ogre | 35 | Giant | No | Blunt | -10% Mind 25% Disease |
| Open Beer Barrel | 1 | No | |||
| Orc Miner | 65 | No | Pierce | 5% Blunt -10% Cut | |
| Orc Raider | 70 | No | Cut | -4% Mind 5% Poison | |
| Orc Reaver | 78 | No | Cut | 6% Blunt -5% Magic Missile | |
| Orc Renegade | 11 | No | Blunt | ||
| Orc Renegade Mage | 25 | Humanoid | No | ||
| Orc Renegade Shaman | 20 | No | |||
| Orc Renegade Soldier | 16 | No | |||
| Orc Renegade Warrior | 14 | Humanoid | No | Blunt | |
| Orc Warmonger | 22 | Humanoid | No | ||
| Orca | 92 | No |