Vile Stage

Vile Stage (VAVAステージ) is a short optional stage in Mega Man X3 that features Vile MK-II as a boss.

Access
After defeating two of the eight bosses, warp capsules leading to Vile's stage will appear in three stages. The capsules disappear after Vile's stage is cleared or when the eight bosses are defeated.

Stage
The stage is set inside an abandoned factory that Vile set up as a trap for X. It is a dilapidated factory full of falling debris and old machinery. If the player has defeated Volt Catfish, the stage's electricity will be activated and its two elevators will be functional, giving X a safe ride up the elevator shafts. When X finds Vile, he reveals that the factory is set to self-destruct in a matter of minutes, and keeps him busy to make sure he won't escape. After X defeats Vile, X has 50 seconds to escape from the factory before it is too late and he dies in the blast. After escaping, X returns to the stage where he found the capsule.

If the player doesn't access the stage or defeats Vile without the Special Weapon that is his weakness, Vile will escape and appears as the boss from Doppler Stage B. If Vile is defeated with his weakness (Spinning Blade or Ray Splasher), he will be destroyed and Volt Kurageil appears in his place in the Doppler Stage, and the stage will also have the sub-boss Mosquitus, allowing X to obtain Zero's saber.

Enemies

 * Notor Banger
 * Wall Cancer
 * Hamma Hamma
 * Drill Waying
 * Boss: Vile MK-II

Trivia

 * A warp capsule to the stage was present in Toxic Seahorse's stage during the game's development.