Diababa

Twilit Parasite: Diababa is the boss of the first dungeon, the Forest Temple, in. The boss itself is made up of two large plant heads that resemble Deku Babas and one massive plant head with a hidden eye inside its mouth. Its appearance suggests that Diababa was originally been a Deku Baba that touched a Fused Shadow.

Strategy
After Link enters Diababa's chamber, a large room with four waterfalls and a pool of poisonous water containing a large tree and two logs, the water will start to bubble, and Diababa emerges from the water.

The beginning of the fight starts with only the two smaller heads. Bomblings can be seen perched on logs floating in the water, and the objective is to use the Gale Boomerang to make them collide with each of the two heads. A single hit will defeat each one. The heads will attack with a bite that is easy to anticipate.

The second phase of the fight begins when the larger head bursts out the water. After a few seconds, Ook appears and swings across the room carrying Bomblings for Link to use to stun Diababa's middle head, leaving its eye (the critical point) open for Link to attack with his sword. Upon recovering, Diababa sprays poison at Link, so he must move quickly to dodge it. The two smaller heads also continue to attack occasionally. Link can choose to defeat them, but the heads will regenerate. Link repeats the process and eventually Diababa is defeated.

Upon Diababa's defeat, Link receives the first of the three Fused Shadows and a Heart Container.

Trivia

 * During the second half of the battle, Ook's theme can be heard.
 * When defeated, Diababa, along with Blizzeta, share a different "Boss Clear Fanfare" in comparison to the other bosses in Twilight Princess.
 * There is no solid surface on the bottom of the Diababa's pool. If Link descends into its depths he will fade back to the entrance of the boss room.

Etymology
Diababa is a portmanteau of "Diabolic" and "Deku Baba"