Special Attack.
The model gains Grind Attacks (X), and can make Grind Attacks as Supporting Attacks, ignoring the maximum number of Supporting Attacks. When the model is not Engaged in Combat, X is set to 1.
At the start of each Round of Combat that the model’s unit is fighting, except for the First Round of Combat, X is increased by 1 (e.g. Grind Attacks (1) becomes Grind Attacks (2)).