Eel Hydra (5e Creature)

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Eel Hydra[edit]

Huge monstrosity, unaligned

Armor Class 17 (natural armor)
Hit Points 230 (20d12 + 100)
Speed 30 ft., swim 40 ft.

20 (+5) 14 (+2) 20 (+5) 2 (-4) 10 (+0) 7 (-2)

Skills Perception +8, Stealth +6
Proficiency Bonus +4
Damage Immunities lightning
Senses blindsight 30 ft., darkvision 120 ft., passive Perception 18
Challenge 12 (8,400 XP)

Hold Breath. While out of water, the hydra can hold its breath for 1 hour.

Multiple Heads. The hydra has five heads. While it has more than one head, the hydra has advantage on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious.
Whenever the hydra takes 27 or more damage in a single turn, one of its heads dies. If all its heads die, the hydra dies.
At the end of its turn, it grows two heads for each of its heads that died since its last turn, unless it has taken fire damage since its last turn. The eel hydra regains 13 hit points for each head regrown in this way.

Reactive Heads. For each head the hydra has beyond one, it gets an extra reaction that can be used only for opportunity attacks.

Static Pulse. A creature that touches the eel hydra or hits it with a melee attack while either the hydra or creature is on land and within 5 feet of it takes 3 (1d6) lightning damage. If both the hydra and the creature are underwater, then the range is increased to 10 feet and the creature takes the damage whether it hits or misses. This does not stack with the additional lightning damage from the hydra's bite attack.

Wakeful. While the hydra sleeps, at least one of its heads is awake.

Water Breathing. The hydra can only breathe underwater.


Multiattack. The hydra makes as many bite attacks as it has heads.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 10 (1d10 + 5) piercing damage and 3 (1d6) lightning damage.

Constrict. Melee Weapon Attack: +9 to hit, reach 5 ft., one creature. Hit: 13 (2d8 + 5) bludgeoning damage. The target is grappled (escape DC 18). Until this grapple ends, the creature is restrained, and the hydra can't constrict another target.

Eel hydra, Art by my girlfriend (RebelSeaArt), special thanks to the community of Chaotic Stupid for feedback, RebelSeaArt

The eel hydra is a monster that lurks in the murky depths of the ocean, attacking its prey from ambush. It is thought that the eel hydra is an offshoot of the standard hydra that adapted to life underwater, to the point that an eel hydra can no longer live on land and must return to the water periodically to breathe. Much like a land-based hydra, an eel hydra can regrow lost heads, though the eel hydra also generates electricity within its body that it can use to deliver a deadly shock to its prey or potential predators.

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