The Black Onyx

"The Black Onyx" is a role-playing game developed by Bullet Proof Software. It was released in 1987 for the SG-1000, among other platforms. It was the last SG-1000 game released on cartridge and the last one published by Sega, but it is currently unknown whether it was the last SG-1000 game ever made. MSX and PC-8801 versions had already been released in 1983 and 1984, respectively, meaning this version arrived unusually late. The game was followed by "The Black Onyx II: Search For The Fire Crystal," which was originally released for MSX in 1984.