Films: Something Beneath (2007)
Location: Underground/Civilized Area
Height/Weight: That of a large building.
Summary: It's a classic set-up. Some idiots build their foundation on grounds that have more than meets the eye. But in this case, it isn't ghosts. It's something a bit more physical. Too physical.
History: For eons, a slime-like organism has been lying dormant beneath the ground. Then a conference building got erected over its tomb. Naturally, this angered it, and it proceeded to use its slime to drive people over the edge and cause them to die in a variety of ways.
Notable Kills: Every death by it is based on the fears of its victims. Some quick, others not so much.
Final Fate: The beast itself is confronted deep below the sewers, but just when it's about to go completely insane, its would-be next victim placates it with a Native American prayer. However, it is later shown infecting a particularly corrupt individual. The very same one who started this. Perhaps it was just a way of closing the book on this...
Powers/Abilities: This creature's black goo can possess people and cause them to hallucinate scenarios in which they are confronted by their deepest dread. It can also spread everywhere.
Weakness: Reciting certain prayers will cause it to reconsider your demise.
Scariness Factor: 3.5-Slime that can make your worst traumas manifest again. That's not really something you EVER want to encounter. Sadly, even with that monstrous power, the true form of this thing a Syfy CGI monstrosity that barely gets by with a good design. Also, it has a sense of right and wrong, so there's that.
Trivia: -This film's star, Kevin Sorbo, claimed that it was meant to be a throwback to the old B-movies of the 50s. Mission...accomplished?
-Even slime meant for kids isn't entirely safe. There have been multiple cases of slime-based toys containing the deadly chemical called boron, which can cause burning and illness if handled improperly.