Large unridden monsters can be included in most armies as described in the Warhammer Armies books. Such creatures are ferocious and dangerous, and appear on the battlefield only because they are bound by powerful spells or their masters have spent a lifetime training them.

In the hurly-burly of battle such creatures do not always react as their commander might wish. They might break free of their binding spells or be overcome by their natural instincts. Creatures affected by this rule are indicated in the Warhammer Bestiary section of the Battle Book.