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| Mutator | Author | Info | |
|---|---|---|---|
| Oblivion Vehicle Mutator | 1 mutator , 2 vehicles | ||
| Old Skool Shock Rifle | 1 mutator | ||
| OLStats | 1 mutator | ||
| OMFG Gun 2k4 | 1 mutator | ||
| OMFG Gun Arena | 1 mutator , 1 weapon | ||
| OMG ROFL ROFLMAO OLOLOL!!!!1one | 1 mutator | ||
| Onimercurycrossbowut2004beta2 | 2 mutators , 1 weapon | ||
| Only LinkGuns and the ShieldGun are available in the map. | 1 mutator | ||
| ONS Christmas V2.1 | 1 mutator | ||
| OnsChristmasV21 HQSounds | 1 mutator | ||
| Onslaught Instagib | 1 mutator , 2 weapons | ||
| ONSPlusMutator | 1 mutator | ||
| OpelBlitz | 1 vehicle | ||
| Open Spy Info Broadcaster | 1 mutator | ||
| Outsider | 1 mutator | ||
| Outsider | 1 mutator | ||
| {OVGY} Revival v1.2a |