Dragon Slayer IV: Drasle Family,[a] released outside Japan as Legacy of the Wizard, is a 1987 action role-playing platform video game developed and published by Nihon Falcom for the MSX2.

The game was an early example of an open-world, non-linear action RPG, combining action-RPG gameplay with what would later be called "Metroidvania"-style action-adventure elements.

The player must use the unique abilities of each member of the family to regain possession of the crowns and destroy the evil Keela.

The player takes control of the members of the Drasles and their pet, sending them one at a time into the vast cavern filled with traps, puzzles and monsters, in search of the four crowns, while periodically returning to the family household on the surface to change characters and to obtain a password.

Each member of the family, which consists of the father, mother, son, daughter, and the pet, has different strengths and weaknesses to contribute to this goal.

By discovering and utilizing each character's strengths, the player travels through the extensive dungeon, eventually fighting four bosses to gain the crowns.

Dragon Slayer IV: The Drasle Family was first released for the MSX2 home computer on July 10, 1987, developed and published by Nihon Falcom.