Lucifer (ルシフェル) is the final boss from Super Aleste.
The core of the Sphere, Lucifer appears as a giant blob-like creature with a skull-shaped head. Its main form of attack is to send skull heads with a snake-like body comprised of multiple cells, moving in various different patterns around the screen while shooting cells at the player.
After a while the main head sticks out of the main body, swinging back and forth while shooting bullets before retreating back. The boss is only vulnerable during this time.