Onox

Onox is the evil General of Darkness from the game Oracle of Seasons. He, like Veran, is used by Twinrova, but his goal is to fill the land of Holodrum with destruction. He succeeds in his goal by imprisoning Din, the Oracle of Seasons, and sinking the Temple of Seasons. Even though Link defeats him, his purpose is still served, leading to a much greater problem for Link.

Strategy
To defeat Onox, one must use the spin attack against him until he uses Din. Knock Din away with the Rod of Seasons and continue to spin attack Onox. Then, you fall into a side scrolling cave, and Onox turns into the Dark Dragon. When he puts his hand on the ground, jump on it. Then, charge a spin attack and jump off his hand and hit his jewel on his head.

Trivia

 * The Gerudo Symbol appears on the chest plate of Onox's armor.
 * Onox also bears a striking resemblance to the Iron Knuckles from Ocarina of Time, despite the fact he wears golden armour instead of white or black and uses a flail instead of an axe.
 * Onox's name is misspelled in the linked game as Knox, when Twinrova announces that she will not fall like Veran or 'Knox'.