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.

To defeat Onox, one must use the spin attack on 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.

Note
If you have played Ocarina of Time Master Quest, then that symbol on a switch is the same one his chest. Also, if you have played Majora's Mask than you will realise that Kafei's pendant is a similar design to the tattoo on his armor. And surprisingly it's on Zant's outfit!