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