Diababa

Twilit Parasite Diababa (覚醒寄生種 ババラント) is the boss of the Forest Temple, the first dungeon in The Legend of Zelda: Twilight Princess. It is a giant three-headed Deku Baba that has taken over the temple. Once defeated, Link receives the first Fused Shadow as well as the first full Heart Container.

Battle
The battle begins with Diababa having two Baba heads. After the pair is defeated by having Bomblings flung in their mouths via Gale Boomerang, Diababa's central head emerges from the pool of water in the room. At this point, Ook starts bringing Bomblings to Link, which he can use to hit Diababa by using the Gale Boomerang. After this, Diababa's head falls to the floor, exposing its eye to sword attacks. After a repetition of this process based on the damage dealt by Link's sword attacks, Diababa will be defeated.

Video
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Trivia
Diababa bears a mild resemblence to the monster "Biolante" from the Godzilla series. Most people wouldn't know it, but the second time you knock Diababa down in the second phase, you can use the Ending Blow to finish him there without a combo.

Etymology
Diababa's English name is formed from the prefix di- (meaning two) and the latter part of the Deku Babas' name. This could be referring to its initial appearance: two giant Deku Babas. It could also come from the Greek work for devil, diabolos.