Hecatomb

The Hecatomb is one of the main antagonists of the horror game, Phantasmagoria 2: A Puzzle of Flesh - an infamous "interactive movie" style video-game focusing on both psychological and body horror, with a mentally unbalanced protagonist and many minor villains (or at the least, negative role models) appearing throughout the often complicated storyline.

The Hecatomb is the main homicidal force of the story however and is a hideously deformed alien version of the main protagonist from a hell-dimension known as Dimension X, enraged at being trapped in this hell-dimension for years the Hecatomb brutally murders many of the main protagonist's friends and enemies whilst haunting him with horrific flash-backs and psychological torture that makes him doubt his own sanity (having already experienced mental breakdowns in the past).

In fact the Hecatomb was deliberately trying to drive the main protagonist insane so it could possess his body and return to the human world, when the Hecatomb reveals itself however it murders the main protagonist and decides to take his place on Earth, however in the process it is confronted by a superior asking it to return to Dimension X as well as Jocelyn, who claims she loves the Hecatomb regardless of its murderous nature.

In the end the Hecatomb can have two "fates" - depending on player choice: it can either spand one last day with Jocelyn before departing to Dimension X or it remains on Earth living the life of the now deceased protagonist.