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Name   |
Combat Level |
Members Only | Number of Lifepoints |
XP | Slayer XP |
| Ocga | 5 | Yes | 100 | Unknown, please submit. | 0 |
| Ochre blamish snail (level 14) | 14 | Yes | 500 | 42 | 0 |
| Oculi apoterrasaur | 0 | Yes | 90000 | 0 | 0 |
| Ogre (level 67) | 67 | Yes | 4800 | 303 | 60 |
| Ogre (level 86) | 86 | Yes | 9300 | 228 | 60 |
| Ogre chieftain | 81 | Yes | 11600 | 681 | 60 |
| Ogre guard | 65 | Yes | 0 | Unknown, please submit. | 80 |
| Ogre Shaman | 113 | Yes | 0 | Unknown, please submit. | 0 |
| Ogre statue | 75 | Yes | 5000 | 380 | 0 |
| Ogre trader | 70 | Yes | 600 | Unknown, please submit. | 60 |
| Ogress | 58 | Yes | 2100 | 152 | 70 |
| Ogress champion | 67 | Yes | 2400 | 202 | 87 |
| Ogress warrior | 63 | Yes | 2250 | 175 | 80 |
| Oily bakami | 0 | Yes | 0 | 0 | 0 |
| Oily orokami | 0 | Yes | 0 | 0 | 0 |
| Oipuis | 75 | Yes | 2700 | 201 | 55 |
| Onyx dragon | 126 | Yes | 50000 | 2376 | 1859 |
| Oomlie Bird | 89 | Yes | 11400 | 458 | 40 |
| Orc | 20 | Yes | 330 | 599 | 0 |
| Ork | 95 | Yes | 6800 | 796 | 0 |
| Ork legion | 86 | Yes | 3500 | 298 | 50 |
| Ork statue | 71 | Yes | 5100 | 340 | 0 |
| Ornate tortle | 0 | Yes | Unknown, please submit. | 0 | 0 |
| Othainian | 78 | Yes | 2800 | 290 | 0 |
| Otherworldly being | 63 | Yes | 7450 | 175 | 36 |
| Ouhai | 75 | Yes | 2700 | 280 | 55 |
| Ourg statue | 79 | Yes | 5700 | 350 | 0 |
| Outlaw | 32 | No | 1150 | 50 | 0 |
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