When the servants of Chaos gather together and witness each other's foul splendour, they endeavour to outdo one another in order to prove their worth to their daemonic gods.
BackSource: Warhammer: The Old World Online Rules Index
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Whilst within 6" of a friendly Beastmen Brayherds unit, Warriors of Chaos units (but not characters) may re-roll any rolls To Hit of a natural 1. Whilst within 6" of a Warriors of Chaos unit, Beastmen Brayherds units (but not characters) may re-roll any rolls To Wound of a natural 1.
In addition, whilst a unit from one army list (Warriors of Chaos or Beastmen Brayherds) is within 6" of a friendly unit drawn from the other army list, it may apply a -1 modifier to the result of any Flee roll.
Note that characters and any units present in both army lists (Chaos Spawn, Chaos Warhounds, Dragon Ogres, Dragon Ogre Shaggoths and Chaos Giants) are unaffected by this special rule.