Shadow Devil

Shadow Devil (シャドーデビル) is a Devil type robot that appeared in Mega Man X5. He attacks similarly to the original Yellow Devil, and his weakness (the eye) can appear on different parts of his body, which 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 more quickly, 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 fortress boss music from the first Mega Man game, 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 Elec Man's Thunder 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. If the eye shows up, try to use a fully charged shot at the devil's eye.

Trivia

 * Early in its development, Shadow Devil was originally called "Metal Devil" (メタルデビル) and was silver.
 * The Shadow Devil is considered to be the toughest Devil robot, as well as one of the toughest bosses in Mega Man history, as its attacks can heavily drain the health gauge and may also lead to an instant death for X and Zero if they are unprepared.
 * When it becomes a giant ball again, it leaves behind a green outline of itself from where it used to be. X and Zero get damaged heavily when they touch the center of the outline. The outline disappears when the Shadow Devil has completely re-formed on the other side.