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The Black Dragon is one of the nine items that Wario can purchase from the Item Shop in the Game Boy Advance game Wario Land 4. The shopkeeper sells Wario these items to assist him in defeating a challenging boss by doing pre-damage at the battle's start. It costs ten Frog Medals to purchase. The price may be higher, depending on the game mode. When purchased, the Item Shopkeeper will follow Wario into the boss room. She will then transform into a black dragon, which then breathes fire on the boss. After the damage has been dealt, the Item Shopkeeper exits the room, leaving Wario to fight a greatly weakened boss. The damage varies depending on the boss, but it is most effective against Cractus, dealing 10 damage.