The False Hydra turns player forgetfulness into horror, making it one of the smartest and most memorable homebrew monsters in D&D.
I have been playing Dungeons & Dragons for more than 20 years, and in all that time, I have never encountered a monster more original and interesting than the False Hydra. Perhaps the most popular homebrew creature of all time, the False Hydra was created in 2014 by Arnold Kemp and published on his blog, Goblin Punch. As I was looking for ideas for a short adventure to run for my regular group, I stumbled upon this fearsome creature and decided to subject my players to the horror that is the False Hydra.
What makes it so compelling? No one knows it’s there. The False Hydra’s song generates an inattentional blindness effect: Every creature who hears it (usually in a five-mile radius) fails to perceive the monster, even if it’s right in front of them, ready to feast. Moreover, this twisted protection system extends to the victims of the False Hydra. Any creature devoured by the beast will be forgotten, erased from the memory of the songs’ victims. Add to this a creepy aesthetic inspired by the most disturbing creature in The Legend of Zelda: Ocarina of Time, and the False Hydra’s habit of infiltrating quiet, remote villages, and you’ve got all the elements for a great horror adventure — something that’s not easy to pull off in D&D’s high-power fantasy context.
Running a False Hydra offers a DM endless opportunities for clever, memorable, and sometimes truly chilling story bits. For my adventure, I admit to borrowing a lot of them from this video from another amazing creator, The Toast Thief. I won’t spoil it in case readers will find themselves in a False Hydra adventure someday, but let me just say that messing with characters’ memories is one of the most interesting things that a DM can do at a table.
Here is the elephant in the room, however: While characters can pretend to forget information in-game, you can’t actually memory-wipe your players (unless the flashy sticks from Men in Black have already been invented, in which case, sign me up for one).
