Shadow Devil

Shadow Devil (シャドーデビル) is another Devil type robot that appeared in Mega Man X5. He attacks similar to the original Yellow Devil, and his weakness (the eye) can appear on different parts of his body that can throw the player off-guard. After he loses a lot of energy, he will turn into Dr. Wily's Wily Machine from Mega Man 6 and will attack the enemy faster, making it harder to dodge his attacks. During the short duration of this form, the eye will periodically appear at the dome of the skull. His background music is a remix of the Megaman 1 fortress boss music, and a warped W appears in the background.

Strategy against Shadow Devil

 * The Shadow Devil is weak to the Tri-Thunder weapon, but can only be damaged by it while his bright-red eye is exposed. This is a direct throwback to the original Yellow Devil's weakness to the Elec Beam (which itself is nearly identical to the Tri-Thunder).
 * If you are unable, try avoiding the blobs that try to hit X and Zero. And if the eye shows up, try to use a fully charged shot at the devil's eye.

Trivia

 * The Shadow Devil is considered to be the toughest Devil robot, as well as one of the toughest bosses in Mega Man history. This may also lead to an instant death for X and Zero if they are unprepared.
 * Skull Man, even though is a very tricky robot to defeat, is outmatched by Shadow Devil.
 * The boss music for Shadow Devil is a remix of Wily Fortress Boss music from MM1.
 * When it becomes a giant ball again, it leaves behind a green outline of itself from where it used to be. X and Zero gets damaged heavily if they ever go into the center of the outline. The outline disappears when the Shadow Devil has re-formed on the other side.