A Warhammer battle is packed with fantastic creatures and skilled warriors whose abilities are so incredible and varied that the basic rules cannot possibly cover them all. For such circumstances we have special rules – uncommon rules to govern uncommon circumstances.

When a creature has an ability that breaks or bends one of the main game rules, it is often represented by a special rule. A special rule can boost a model's chances of causing damage, such as by granting poisoned weapons, or enhance its Strength. Alternatively, a special rule can improve a model's survivability, by granting it a better armour save or the ability to regrow damaged flesh. It is through the use of the special rules that Dragons breathe fire, Assassins strike with lightning speed and Giants cause bowel-loosening terror in their enemies.