"Devil Golvellius") is an action role-playing video game developed by Compile and originally released for the Japanese MSX home computer system in 1987.
Sega licensed the franchise in 1988 and released the game for the Master System (the Mark III in Japan), featuring enhanced graphics and entirely different overworld and dungeon layouts.
[N 2] The game also consisted of an underground portion in caverns, rotating between a sideways advancing and top down scrolling screen in order to reach a level boss's lair.
The final level, only reachable once all boss monsters have been beaten, is to defeat Golvellius who has a secret lair revealed by following clues of the game characters.
Once Golvellius is defeated, it is revealed he was possessed by a demon and is in fact a good and kind creature who will now travel with the hero Kelesis.