Ah, the hydra. A classic fantasy staple. Be it from Greek myth or just a typical fantasy adventure story or even Dark Souls, every knows and loves the hydra.
Unfortunately, if we’ve learned anything from the centaur or the cyclops, it’s that they don’t exactly hold up in Dungeons and Dragons. But who knows? Maybe I’ll be pleasantly surprised.
Lore: Vengeful Blood
Oh, that’s a cool title. ‘Vengeful Blood’. I might have to use that in a book sometime.
At the dawn of time, Tiamat, queen of all evil and dragons, slew a rival dragon god, Lernaea, and cast her blood all across the multiverse. Each drop spawned a multi-headed hydra with a hunger matched only by their sire’s hatred. Over time, great warriors would prove themselves champions by defeating these beasts.
To be consumed by a hydra is a vicious and excruciating death. It systematically consumes anything it can reach within its territory, then moves on to hunt elsewhere. So great is their hunger that they may even turn on themselves like a snake devouring its own tail.
Naturally aquatic, hydras can often be found near bodies of water. Rarely do they take shelter from the elements, leading to a lack of a proper lair. It is only in colder climates that a hydra might bother making one. Make no mistake, however; homeless as they are, a hydra is cautious, leaving one head awake to keep watch when it rests.
You know, for a creature born from the death of a rival to Tiamat, the lore here is pretty disappointing. It can make for some cool, creepy set pieces. Perhaps the players can wander through former hydra territory and find no living things in sight. Or maybe you can get creative and come up with some plotline to resurrect Lernaea for a proper boss fight with their blood. What little the lore gives can be bended into some really fun plots or moments.
Design: King Ghidorah Joke
I’m sorry. But the Godzilla fanboy inside me couldn’t help me. Accurate or no, I can’t help it. I see a multi-headed golden dragon-like creature, and something just clicks in my brain.

My personal kaiju biases aside, this is a decent design. It’s definitely not anything new; what new can you do with a hydra? But this look is wonderfully effective.
Just look at those heads! Those are sinister as shit! You can practically hear its stomach growling as their hissing heads slowly move to surround you. And those legs may be short, but they’re some strong-looking dinosaur limbs; you can tell that you ain’t getting far if you try to run.
It isn’t an especially creative design, sure. But you can take one look and immediately know what you’re looking at. It ain’t creative, sure, but it sure as hell is effective.
Stats: Many Foes in One
This dude is a bargain bin for an encounter! You’ve got seven enemies all in one body!
At its core, the hydra is a pretty simple monster. It’s pretty damn bulky, with a decent AC and a near 200 HP pool. All it can really do is bite, which can be pretty dangerous depending on how many heads it has.
Killing it, however, is far from easy. All thanks to its unique ability: Multiple Heads.
So long as it has more than one head, this ability is in play. With that, the hydra has advantage on all saving throws against most status effects. Should it take 25 points of damage, one head will die. However, at the end of the turn, two more will take its place, restoring 10 HP each. The only way to prevent this is to deal fire damage in the time between its turns.
On top of that, it has Reactive Heads. With this, the hydra gets an extra Reaction for every head it has. Make sure your party is willing to use the Disengage action, or they’re gonna have to deal with a lot of Opportunity Attacks.
Also, as stated in the lore, one head is always awake. So… good luck sneaking up on it.
Placement
This was a mixed bag of a monster. Mostly positive! But mixed. The lore has potential, despite how sparse it is. Its design is simple, but wonderfully effective. Its stats are simple, but they can make for unique and difficult encounter. This fantasy staple has definitely earned a spot in line for any campaign.
With all that in mind, let’s put the Hydra on the Best of the Bestiary!
- Beholder
- Death Tyrant
- Dragon Turtle
- Green Dragons
- Red Dragons
- Blue Dragons
- Black Dragons
- White Dragons
- Silver Dragons
- Couatl
- Behir
- Aboleth
- Sea Hag
- Bronze Dragons
- Brass Dragons
- Copper Dragons
- Gold Dragons
- Chuul
- Gibbering Mouther
- Chimera
- Death Knight
- Fomorian
- Bone Devil
- Dracolich
- Faerie Dragon
- Hobgoblins
- Night Hag
- Green Hag
- Ankheg
- Hook Horror
- Storm Giant
- Hill Giant
- Empyrean
- Efreeti
- Grimlock
- Dao
- Cloud Giant
- Drow (all four of ’em)
- Shadow Demon
- Marilith
- Drider
- Aarackockra
- Azer
- Demilich
- Spectator
- Hydra <————————
- Marid
- Harpy
- Half-Dragon
- Cambion
- Fire Giant
- Animated Armor
- Banshee
- Basilisk
- Yochlol
- Bulette
- Cloaker
- Darkmantle
- Doppelganger
- Ghoul and Ghast
- Ettin
- Pit Fiend
- Erinyes
- Chain Devil
- Bearded Devil
- Barbed Devil
- Spined Devil
- Ice Devil
- Djinni
- Nalfeshnee
- Glabrezu
- Chasme
- Grell
- Barlgura
- Horned Devil
- Balor
- Shadow Dragon
- Vrock
- Dretch
- Gnolls (all three)
- Goristro
- Hezrou
- Manes
- Frost Giant
- Duergar
- Quasit
- Dryad
- Flumph
- Goblin
- Githyanki
- Planetar
- Imp
- Clay Golem
- Flameskull
- Displacer Beast
- Carrion Crawler
- Githzerai
- Grick
- Rug of Smothering
- Bugbear Chief
- Bugbear
- Flesh Golem
- Vine Blight
- Twig Blight
- Needle Blight
- Bullywug
- Hellhound
- Ettercap
- Gas Spore
- Cockatrice
- Lemure
- Homonculus
- Solar
- Deva
- Gorgon
- Hippogriff
- Griffon
- Cyclops
- Centaur
- Ghost
- Fire Elemental
- Water Elemental
- Air Elemental
- Stone Giant
- Deep Gnome
- Dinosaurs (All six of them)
- Iron Golem
- Stone Golem
- Earth Elemental
- Galeb Duhr
- Helmed Horror
- Flying Sword
- Crawling Claw
- Violet Fungus
- Shrieker
- Gargoyle
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