Fire Vampires

Fire Vampires are composed of thousands of tiny points of light, all of which are living entities of flame, and as such, burn anything they touch. From a distance, the individual points are indiscernible, so it appears to be an intelligent plasma.

In the RPG...

I think the most interesting thing about Fire Vampires is that they are killed in the same way as standard fire would be—as in water, a fire extinguisher, a bucket of sand etc. While a paranoid investigator might have a gun on them, there's very little chance that they'll be carrying any of those things. Even if they do have some water on them, it's doubtful they would have the 1½ gallons (5.7L) it requires to take out an average Fire Vampire. As mentioned above, they also burn anything they touch, so if encountered in a house, there's a good chance the whole thing will be up in flames by the time the hapless victims escape.

    The Fire Vampire's attack is a little different than other Call of Cthulhu enemies. Instead of fighting back or dodging, an Investigator must make combined CON and POW rolls. If they pass the CON roll, attack damage is halved, and if they lose an opposed roll with the Vampire's POW, it steals magic points from them as well. An average Investigator has a 71% chance of losing this one, and considering that same Investigator would only have 10 magic points, there's a chance they could lose them all in one go. On top of these two effects, a Luck roll is also needed to determine if the Investigator's clothing is set alight.

    The 7e Malleus Monstrorum hasn't changed any of the Vampires' stats, though it has given them some new abilities. The first of these is that multiple Fire Vampires can cluster together into a fireball. It does an average of 21 damage, though just as with their regular attack, this can be halved by passing a CON roll. Clothing can be set alight here, too. The other new ability is where multiple Vampires can perform a "crazed dance" which mezmerises its targets if they fail a POW roll. Once affected, they need a Hard POW roll to snap out of it (or a regular roll if their allies slap or shake them to their senses). It says a bucket of water will also snap them out of it without needing a roll, but said bucket would probably be better used upon the Fire Vampire.

In a video game...

I've played video games where an extinguisher is needed to put out fires, but I can't recall any that have used them as a weapon, so I think that would make for a cool addition to the usual arsenal. Tangentially, it would even make for an interesting weapon against humans, should the player not have their guns for whatever reason. Picture this: You encounter a Fire Vampire, grab a nearby extinguisher and douse it. As you turn to leave, a cultist appears in the doorway. You spray him in the face, and while he's wiping foam from his eyes, you bring the tank down on his head with a satisfying DONG.

In a film...

I'm not sure how interesting or scary a floating blob of fire would be in a film, to be honest, sentient or not. If anyone has thoughts to the contrary, feel free to leave a comment below.