Dominant (X) [Passive] This model counts as the number of models as shown in brackets when working out how many models are in range of an objective, in a specific area of the board, or when working out how many models have escaped the battlefield. So, a model with Dominant (3) would count as three models in range of an objective, or in a specific area of the board, or three models when working out how many models have escaped the battlefield. If a model would gain this special rule whilst in range of another model or specific area of the board, and then Moves off the board, they will not gain the benefit of this special rule once off the board.
If a model has two sources of the Dominant (X) special rule, then they use the highest value.