Dragonslayer (1981)

(FROM DESCRIPTION ON BACK OF BOX) ... In Dragonslayer, you are a magician embarked on a quest to destroy Vermithrx Pejorative, the last dragon. Before you confront the dread beast, you must travel throughout the island kingdom of Urland in search of companions, magical items, spells, and weapons. Your journey will be eased or hindered by events that occur along the road, and your every step will be dogged by the King's men - desperate men who would take you captive to thwart your mission. And should your good fortune and skill see you through all the dangers of the road, the greatest peril yet awaits you. You must face and match the awesome creature you have sworn to destroy before you can win ... before you can claim the title, Dragonslayer.