Bat Wario, also known as Vampire Bat Wario, is one of Wario's many transformations in the Wario Land series of games, appearing in Wario Land 4. It appears in four levels: Crescent Moon Village, Arabian Night, Hotel Horror and Golden Passage.
The Bat Wario transformation can be triggered by coming in contact with a Minicula, causing Wario to become a bat, sporting a pair of pointy fangs, bat wings in place of his arms, an indigo skin tone, and red eyes. This reaction is similar in ability and appearance to the bat form of Vampire Wario, a key difference being that he cannot transform into an actual vampire, unlike in Wario Land 3. To turn into his normal self, he must go into a patch of light or fall into a pool of water (similar to Zombie Wario).
Wario Land 4
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