Vril - An Ancient species of terrestrial parasitical dinosaur which are humanoid in nature and intelligent to an extent with an ability to biologically bodysnatch other living things. They Live deep underground, surviving so many cataclysms on earth by being sheltered. Bodysnatching achieved through inserting a worm ejected from a proboscis into and around the eye into the brain which then secrete parasitical cells that dominate the host's brain. Needs several weeks recovery time. Carnivorous, vicious and monstrous.
There are three types of vril - Type 1, type 2 and type 3.
Related concepts- Goblins, trolls, leprechauns, elfs, fairies, imps, gnomes, gremlins, dwarves, Crab people, Chupacabra, Vampires.
References - South Park, Star Trek, Stargate, Kos-Crabbuckit, They Live. The Host, Under the Skin, Gremlins.
Notes- Types one and two are small and have features similar to crustaceans like the king crab, they have pincer-like claws and back facing hind legs like that of a cat, squeaky high pitched voices. Easily stomp-able yet fast and deadly in high numbers, acidic saliva that burns worse than mace when in contact with eyes or skin. Eyes on stalks, see primarily through sonar so extremely loud sounds are a weakness. Type 2 seemingly unable to bodysnatch but make up for being larger and tougher to kill. The Kos- Crabbuckit song references the movie They Live where a guy has truth glasses and he sees things others dont yet in this song certain people are different because they have crab heads. Parasitical crab creatures.