Decaying Serpent

large monstrosity (undead), neutral evil

Challenge 5.0 (1,800 XP)

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STR
18 (+4)
DEX
12 (+1)
CON
16 (+3)
INT
1 (-5)
WIS
8 (-1)
CHA
3 (-4)

Proficiencies & Senses

Saving Throws Constitution, Wisdom
Skills
Stealth +6, Athletics +6, Perception +3, Intimidation +7
Senses
darkvision 60 ft.
passive Perception 13

Characteristics

Damage Vulnerabilities
Radiant
Damage Resistances
Piercing, Slashing
Damage Immunities
Poison, Necrotic
Condition Immunities
Blinded, Charmed, Deafened, Frightened, Paralyzed
Languages Understands Common but can't speak

Traits

Undead Fortitude

If damage reduces the Decaying Serpent to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the serpent drops to 1 hit point instead.

Decaying Gaze

As a bonus action, the Decaying Serpent can focus its gaze on a target within 30 ft. The target must succeed on a Wisdom saving throw DC 15 or be frightened until the end of its next turn.

Actions

Bite

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 21 (3d10 + 4) piercing damage, and the target must succeed on a DC 15 Constitution saving throw or take 10 (3d6) poison damage.

Constriction

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: the target is grappled (escape DC 15). Until this grapple ends, the target is restrained and takes 14 (2d8 + 4) bludgeoning damage at the start of each of its turns.

Reactions

Death Throes

Upon reaching 0 hit points, the Decaying Serpent explodes in a burst of necrotic energy. Each creature within 20 ft. must make a DC 15 Constitution saving throw, taking 27 (6d8) necrotic damage on a failed save, or half as much damage on a successful one.

Combat Behavior

Tactics


• Utilizes ambush tactics by hiding among debris or in murky waters.
• Focuses attacks on weaker-looking characters, using fear to break morale.
• May retreat if severely damaged, only to recover and return for vengeance.

Combat Style

Territorial ambusher, relying heavily on stealth and fear to subdue enemies.

Morale

The Decaying Serpent will fight to the death unless near death itself, at which point it will attempt to escape.

Monster Description

The Decaying Serpent is a dreadful sight to behold, slithering silently across wet, moss-covered ground. Its dark green scales appear as if they are melting away, betraying the creature’s undead nature. Normally, such a creature would be the pride of the wilderness, but this one is a hollow mockery of life. Its eyes flicker with a malevolent intelligence as it hunts for the warmth of living beings. The serpent’s massive body stretches like a morbid ribbon through its surroundings, leaving behind a trail of decay and rot. Its large, sharp teeth are not only menacing but suggest a powerful bite that can pierce through armor. Decaying and putrid, it emits an overwhelming stench that signals its approach long before it is seen.

Legends speak of the Decaying Serpent as once being a guardian spirit of powerful swamps. However, a dark ritual involving forbidden necromancy corrupted its essence, transforming it into a voracious predator of the living. Its ability to induce fear with a single gaze is said to be an echo of its past authority, now twisted to paralyze would-be defenders. Adventurers may come across this creature while exploring the remnants of ancient ruins buried in swampy depths, often lured by promises of treasures guarded by the serpent, only to find themselves faced with an inevitable doom.

Monster behavior

The Decaying Serpent relies on stealth and surprise, often lurking in the shadows of wetlands or ancient ruins. When it senses prey, it uses its Decaying Gaze to instill fear, creating an advantage before launching a swift attack with its bite. It is cunning enough to retreat if the odds are against it but will employ its formidable constriction ability to crush its prey when it has them grappled. The serpent exhibits territorial behavior, preying on anyone who dares to invade its domain. Its attack patterns are brutal, favoring a combination of bites and grappling tactics to immobilize victims while delivering poisonous strikes. The Decaying Serpent thrives in ambush, striking at its foes with deadly precision before slithering away into the shadows once again.

Ecology

The Decaying Serpent plays a pivotal role in its ecosystem as an apex predator in decaying wetlands. Although it is a remnant of life, its existence perpetuates a cycle of death, feeding on weaker creatures and ensuring that the swamp does not become overrun by lesser entities. It disrupts the food chain, yet also serves to maintain a fragile balance by clearing out the sick or dying animals, furthering the decay that enriches the land. The serpent's presence fosters a unique environment where other undead creatures may arise or where carnivorous plants flourish, thus adding layers to the ecosystem.

History

The Decaying Serpent's transformation is a tragic tale interwoven with themes of corruption and loss. Long ago, it was a revered guardian of ancient swamps, serving a benevolent role in maintaining the balance of nature. Its powers were drawn from the life force around it, promoting growth and health in its domain. However, as greed and ambition spread among ancient cultists, a dark ritual was devised to harness this power for personal gain. The ritual, fraught with foul energies and necromantic sorcery, backfired, corrupting the guardian and plunging it into a realm of death and decay.

Now, it roams the swamps as a chilling reminder of the past, sought by adventurers for its lost treasures yet feared for its devastating abilities. Many who seek the treasures are instead consumed, reinforcing the curse the Decaying Serpent carries. Few have returned from encounters with it, and those who have speak of the lingering stench of decay and the palpable sense of dread that surrounds this once-great creature. As it slithers through the shadows, it leaves behind tales of horror and chilling warnings to all who dare tread too close.

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