Savage Legends: Splintered
Those who fall prey to madness and take their own lives sometimes attract Chaos spirits who become trapped in a state between life and death. These unfortunates, known as allips, suffer from the violent and incurable insanity their host faced in life and take out their terror, confusion, and rage upon the living. They reach out to those they encounter—possibly in wrath, but also perhaps oblivious to their own insane nature—spreading the psychoses that led to their own untimely deaths.
Allips often seek to harm those who played a part in causing their mad, unholy condition. When faced with such foes, an allip ignores all other targets that confront it in favor of its hated enemies, attacking them until its tormentors have been forced into a vacant stupor. Alas, such vengeance does not put the allip to rest, but simply serves to further fuel its madness as it finds itself trapped in a world now no longer even holding the satisfaction of vengeance.