Overview
Feud is an adventure game designed by John Pickford for Binary Design and published in 1987 as the first game under the Bulldog Software label of Mastertronic. Versions were released for the Amiga, Amstrad CPC, Atari 8-bit family, Atari ST, Commodore 64, MS-DOS, MSX, and ZX Spectrum. The player takes on the role of the sorcerer Learic, and must fight his evil twin Leanoric.
Gameplay
The only real enemy is Leanoric. To achieve your objective, the player must collect many herbs scattered across the map and mix them in a cauldron to make offensive and defensive spells. The spells vary from fireballs and lightning to invisibility and even turning peaceful villagers into zombies. A compass indicates Leanoric's location. Several of the herbs are found in a garden, tended by a gardener. The gardener, though slow-moving, is also able to inflict damage on Learic.
Leanoric, as a non-player character, has to do the same thing, collecting herbs to mix in his cauldron before hunting you down in order to attack.
From Wikipedia (CC BY-SA 4.0).