Lich

In folklore, a lich (/ˈlɪtʃ/; from Old English līċ meaning “corpse”) is a type of undead creature. Often such a creature is the result of a transformation, as a powerful magician skilled in necromancy or a king striving for eternal life using spells or rituals to bind his intellect and soul to his "phylactery" and thereby achieving a form of immortality. In reality, a lich is very much the same. They are magic users that through whatever means became an immortal undead creature. These means can vary as there are spells, rituals, and even beings such as Ah Pwash that can create a lich. They are not mindless like many undead; rather, they retain their knowledge and magical powers, and seek out the living for two purposes. One is that they feast on souls and life, and the other is that once they do, they can raise the husk that they leave behind, animating and controlling it.