Hollowed Ones

Soldiers deserting armies are often allured by the glows of strange lanterns. They stumble through the dark on after those, and perish. ...Only to rise again as empty shells stripped of hate and fear. They are then provided rifles and march in ranks beneath that lantern.

Ancient corpses that sit in tombs are possessed by the wisps, beings of energy or souls of the restless dead. These wisps do not want the living to leave the tombs, caverns, or wherever it was that the wisps originally died, because they want to add to the number of corpses.

A Forlorn or another sentient undead becomes attacked by a necromancer and engages in a battle of wits. They enter a defenerative state over time, and unless they appeal to their sentience, fail.

Be it necromancers, wisps, or the great lantern wisps, several factors contribute to producing the Hollowed Ones, marching soldiers and stumbling beasts of the dead.

Despite the variety of methods, the Hollowing is still a process that connects to Necromancy, and is still the work of the Lurker on the Threshhold.

Trivia
Hollowed Ones are based from the Hollow Men of Fable and Fable III, the Hollowmen from Privateer Press's Hordes, and the Hollow from Dark Souls.