Instructions
Attack Brood Lords with flying air-to-air units such as the Terran Viking, Battlecruiser or Protoss Phoenix. Brood Lords don't have any air-to-air defenses against other flying unit, and they are not very durable.
Defeat a Brood Lord with a large group of ground units with surface-to-air capabilities. These units include Terran Marines, Protoss Stalkers and Zerg Hydralisks. You can back up some units, such as the Marines, with healing units like the Terran Medivac dropship.
Defend against Brood Lords with anti-air structures, such as the Terran Missile Turret, Protoss Photon Cannon or Zerg Spore Crawler. Build these structures next to your other buildings to protect them from flying units like the Brood Lords.