| Mod | Save | ||
|---|---|---|---|
| STR | 24 | +7 | +14 |
| DEX | 14 | +2 | +2 |
| CON | 26 | +8 | +15 |
| Mod | Save | ||
|---|---|---|---|
| INT | 9 | −1 | −1 |
| WIS | 14 | +2 | +2 |
| CHA | 10 | +0 | +0 |
Heads. The Blood Hydra has five heads. While it has more than one head, it has advantage on saving throws against being blinded, charmed, deafened, frightened, stunned, or knocked unconscious. The hydra makes one Bite attack per head when it takes the Attack action. Each time it loses a head, it loses one Bite. If it takes 30 or more damage from a single attack, one of its heads is severed.
Regrowth. At the start of its turn, the hydra regrows two heads for each head it lost since its last turn, unless it took fire or radiant damage during that time.
Blood Frenzy. The hydra has advantage on attack rolls against any creature that is below its hit point maximum.
Crimson Feast. When the hydra deals piercing damage with a Bite, it regains hit points equal to half the damage dealt. If the target is below half its hit points, the hydra instead gains temporary hit points equal to the full damage dealt (maximum 50 temporary hit points).
Reactive Heads. The hydra can take up to three reactions per round, but no more than one per turn.
Multiattack. The hydra makes five Bite attacks, one with each head.
Bite. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 19 (2d10 + 7) piercing damage plus 10 (3d6) necrotic damage. If the target is a creature other than a construct or undead, it must succeed on a DC 21 Constitution saving throw or take 10 (3d6) necrotic damage at the start of its next turn.
Blood Mist (Recharge 4–6). The hydra exhales a swirling crimson fog in a 30-foot radius centered on itself. Each creature in the area must make a DC 21 Dexterity saving throw, taking 28 (8d6) necrotic damage on a failed save, or half as much damage on a successful one. The area is heavily obscured until the start of the hydra’s next turn. A creature that starts its turn in the mist takes 10 (3d6) necrotic damage.
Hydra’s Retaliation. When a creature within 10 feet of the hydra deals damage to it, the hydra makes one Bite attack against that creature.
Description
A Blood Hydra is a grotesque evolution of the classic Hydra, its flesh swollen with stolen vitality and its veins visibly pulsing with dark, alchemical blood. Its many heads drip crimson ichor, and each maw constantly leaks a faint mist that smells of iron and decay.
Where a normal hydra is a territorial apex predator, a Blood Hydra feels wrong—as if something has rewritten its biology. Its wounds do not merely close; they multiply. Severed necks burst into new life, splitting and writhing like living arteries.
The ground around it is often stained deep red. Pools of diluted blood collect in its lair, and the air itself can become hazy with a lingering, choking mist of life essence torn from prey.
Origins & Nature
Scholars argue that Blood Hydras are not natural creatures at all, but the result of:
- Failed rituals tied to Vecna or other necromantic powers
- Exposure to aberrant forces like the Far Realm
- Ancient hydras that have fed for centuries on magical creatures, war battlefields, or cursed bloodlines
Unlike typical hydras, a Blood Hydra doesn’t just regenerate—it consumes vitality as fuel, creating a feedback loop of violence and growth.
Behavior
Blood Hydras are aggressive, opportunistic apex predators with a disturbing instinct: they prefer prey that is already wounded.
They will:
- Stalk battlefields, following the scent of spilled blood
- Linger near monster territories to ambush weakened survivors
- Attack mid-fight, targeting injured combatants first
- Drag prey into water or mist where visibility is low
Despite their low intelligence, they display a kind of predatory cunning—not strategy, but instinct refined to perfection.
What It Hunts
A Blood Hydra prefers prey that maximizes its regenerative advantage:
- Wounded creatures (its absolute favorite)
- Large beasts and monstrosities
- Giants and trolls (high vitality = more “fuel”)
- Adventuring parties mid-encounter
- Creatures with strong blood or magical essence
It is especially drawn to:
- The aftermath of battles
- Slaughter sites
- Rivers, swamps, and lakes where bodies collect
What It Avoids
Despite its power, a Blood Hydra is not reckless. It instinctively avoids creatures that can:
- Overwhelm it instantly
- Prevent regeneration
- Outscale its healing
It will typically avoid:
- Ancient dragons like Ancient Red Dragon
- Elder hydras or magically enhanced hydras
- Creatures that deal consistent fire or radiant damage
- Powerful aberrations (which it senses as “wrong” even to itself)
- Highly coordinated, uninjured groups of strong foes
If badly wounded and unable to regenerate, it may retreat into deep water or thick mist rather than fight to the death.
Habitat
Blood Hydras favor places where blood and water mix:
- Swamps, bogs, and drowned forests
- Battle-scarred valleys
- Cursed lakes or rivers
- Caverns flooded with dark, stagnant water
Their lairs are often:
- Littered with partially dissolved bones
- Stained permanently red
- Filled with shallow pools that amplify their mist
Signs of a Blood Hydra
Adventurers might notice:
- Water with a reddish tint that doesn’t disperse
- Corpses drained of blood but otherwise intact
- Thick, metallic-smelling fog at ground level
- Tracks that suggest too many heads moving at once
- Survivors of attacks describing “the mist drinking them”
Using It in Your World
A Blood Hydra works best as:
- A third-party predator interrupting another encounter
- A regional threat tied to war, curses, or necromancy
- A boss creature guarding something soaked in blood magic
It’s not just a monster—it’s an ecosystem disruptor, turning entire regions into feeding grounds.
Previous Versions
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10/2/2022 11:33:33 PM
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10/24/2024 7:25:24 PM
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5/4/2026 9:29:42 AM
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