Zombie Mastery is a Rare Global Enchantment belonging to the File:Icon Death.png realm. It may be cast on the overland map for the base Casting Cost of File:Icon Mana.png . While Zombie Mastery is in effect, it will regularly return dead Normal Units to the game, but transforms them into Zombies. This occurs only when an army belonging to Zombie Mastery's caster wins a battle where one or more Normal Units - friendly or enemy - were completely destroyed.