As a member of the undead, the player can use the Turn Undead spell to more easily bring a group of ghouls down. Failing this tactic, the party should utilize powerful melee combatants or other spells to bring them down without much difficulty. When ported to the Nintendo Entertainment System, their sprite was altered into a more ghost-like form, which was used for the Rotting Corpse and Zombie enemies, as well. See the article on Ghoul (MM1) on Fandom's mightandmagic wiki.