Heartbound Parasite

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Medium Aberration, Neutral Evil

Armor Class 13 (natural armor)

Hit Points 52 (8d8+16)

Speed 20 ft.

STR 14 (+2)

DEX 14 (+2)

CON 14 (+2)

INT 10 (+0)

WIS 12 (+1)

CHA 8 (-1)

Saving Throws Con +5, Wis +4

Skills Stealth +6, Perception +4

Senses darkvision 60 ft., passive Perception 14

Languages Common

Challenge 5 (1,800 XP) Proficiency Bonus +3

Regeneration. The parasite regains 5 hit points at the start of its turn if it has at least 1 hit point.

Heartbound Bond. When the parasite implants in a host, the host's endurance is augmented. While the parasite remains embedded, the host has advantage on Constitution checks to resist exhaustion and on saving throws against fatigue.

Actions

Multiattack. The Heartbound Parasite makes two Heartbite attacks and one Sinew Lash attack.

Heartbite. Melee weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 13 (2d8+4) piercing damage. The parasite pierces the chest with a needle-sharp proboscis and plugs into a host's chest, effectively replacing the host's heart.

Sinew Lash. Melee weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 11 (2d6+4) slashing damage. A writhing sinew lash lashes out at a foe, ripping at armor and flesh.

Environment Forest

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Lore & Description

Appearance

A parasite that replaces a creature's heart with a living, pulsating organ that grants extraordinary stamina at the cost of the host's autonomy. It resembles a vein-woven orb, about the size of a human heart, slick with a dark, coppery sheen, anchored by a flexible stalk that can interface with the host's chest. When undisturbed, it pulses with a soft glow and can extend translucent tendrils to steady the body. In combat, it erupts with two blood-slick attacks and can grip a foe's chest with its internal tendrils.

Behavior & Origins

Heartbound Parasites are drawn to life energy and the will to endure. They infiltrate a living host through a chest wound or torn rib, substituting the heart with their own pulsating organ. The parasite grants extraordinary stamina, letting the host push beyond normal limits, but it also dulls the host's autonomy as the parasite anchors itself to a relentless, inexorable pace. These creatures are patient ambush predators, preferring hosts who will not discard them lightly, for removing a Heartbound Parasite is a dangerous affair that can cost the host its life.

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Generation Info

Original prompt:
"A parasite that replaces a creature’s heart but improves stamina."

Created: Feb 2, 2026
Modified: Jun 1, 2026