Airborne invaders charge the castle. They seek to enter by the vents and ducts. Chimera-like, they're clothed with weaponized suits of spiked armor. At the first wave, the guards push the mutants back engaging the assailants only to be unequal to the task. Lured into hand-to-hand, the protectors become too busy to prevent the surging barrage. Plan B begins with the crisis units coming onto the scene. These are skillful hunters deployed when the first wave of protection is overwhelmed and the rooms captured. These soldiers possess the expertise to track down and rub out the intruders. The residues left behind by the terrorists tip-off where they are hiding. It's mortal combat but usually the royal armed forces are triumphant, but only if the grounds are properly fortified in advance.