False Hydra

The False Hydra is a homebrew monster for Dungeons & Dragons whose concept was so chilling, horrifying, and Lovecraftian that it acquired minor meme status in the tabletop community for a while. The False Hydra isn't a true hydra, but rather something much worse: An Aberration that resembles Dead Hand from The Legend of Zelda, but with multiple heads instead of arms, with a new head growing after it devours a set amount of victims. It's true horror, however, is its song. It constantly sings, which makes whoever hears it unable to perceive or remember the False Hydra or any of its victims. Even if one was to slay the False Hydra, anyone it devoured remains forgotten. It usually chooses to lair underneath isolated villages, with various theories as to how it originally comes about. Some say that IT CAME FROM OUTER SPACE, or the Far Realm, crashing into the earth and burrowing into a proper feeding ground. Others say it spontaneously arose from the ground like some sort of Lovecraftian potato, spawned from all the wickedness of the sapient races concealing within the world itself to spawn these horrors. Others say they're a bioweapon from Far Realm races. Whatever the case, they represent a fate worse than just death: being forgotten, even by your own closest teammates and family, no matter how much of a big damn hero you were, no matter how good of a person you were.

The False Hydra also is stated to grow more powerful as it gains more heads, and fatter and immobile as well. Once they reach critical mass, they start altering their song to have their brainwashed minions carry them on massive warmachine cart contraptions from city to city, committing war upon the populace with brainwashed thralls for more victims to glut itself with.