| Name | Attribute | Level | Type |
|---|---|---|---|
| Out of control cavalry | 58 | General Monster | |
| Otherworldly Goblin Grandmaster | 80 | General Monster | |
| Otherworldly Goblin | 83 | General Monster | |
| Otherworldly Eye Demon | - | 1 | General Monster |
| Ore Mud Monster | 85 | General Monster | |
| Orcish Sprite | 55 | General Monster | |
| Orc Rogue | 3 | General Monster | |
| One-Horned Giant | 81 | General Monster | |
| One-Horned Giant | 81 | General Monster | |
| Obsidian Evil | 70 | General Monster | |
| Obsidian Evil | 68 | General Monster | |
| Nocturnal Sprite | 70 | General Monster | |
| Nocturnal Sprite | 70 | General Monster | |
| Nocturnal Spirit | 70 | General Monster | |
| Nocturnal Phantom | 70 | General Monster | |
| Nocturnal Phantom | 70 | General Monster | |
| Nocturnal Elder | 70 | General Monster | |
| Nocturnal Elder | 70 | General Monster | |
| Nocturnal Assassin | 70 | General Monster | |
| Nocturnal Assassin | 70 | General Monster | |
| Nitrore Chest | - | 1 | General Monster |
| Nightmare | 85 | General Monster | |
| Night Phantom | 108 | General Monster | |
| Night Phantom | 98 | General Monster | |
| Nia's Fierce Bird | 17 | General Monster | |
| Necrotoberry | 55 | General Monster | |
| Necrotoberry | 55 | General Monster | |
| Necrosprite | 55 | General Monster | |
| Necrosprite | 55 | General Monster | |
| Necropolis Seal | - | 55 | General Monster |
| Necropolis Seal | - | 55 | General Monster |
| Necropolem | 55 | General Monster | |
| Necropolem | 55 | General Monster | |
| Necropodile | 55 | General Monster | |
| Necropodile | 55 | General Monster | |
| Necrophage | 55 | General Monster | |
| Necrophage | 55 | General Monster | |
| Naughty Gribblin Gallywix | - | 50 | General Monster |
| Naughty Gribblin Gallywix | - | 50 | General Monster |
| Nathel | - | 137 | General Monster |
| Nappa's Bodyguard | 23 | General Monster | |
| Nadirr's Crystal Ward | - | 58 | General Monster |
| Nabu Guard | 48 | General Monster | |
| Nabu Guard | 48 | General Monster | |
| Nabu Guard | 48 | General Monster | |
| Nabu Guard | 48 | General Monster | |
| Nabu Fireguard | 48 | General Monster | |
| Nabu Fireguard | 48 | General Monster | |
| Mystic Shaman Kain | - | 70 | General Monster |
| Mystic Formation Treasure Chest | - | 15 | General Monster |