Deadwalker Zombies

Each time a model in this unit is slain by an attack made with a melee weapon, if that model is within 3" of the attacking unit, roll a dice. On a 5+, the attacking unit suffers 1 mortal wound.

At the end of the combat phase, you can roll a dice for each enemy model that was slain by wounds caused by this unit's attacks in that phase. For each 2+, you can add 1 Deadwalker Zombie model to this unit. Models that are added to this unit with this ability must be set up within 1" of a model in this unit. They can only be set up within 3" of an enemy unit if a model in this unit is already within 3" of that enemy unit. Models added to this unit using this ability can take it above its maximum size.