Large aberration, neutral evil
Armor Class: 17
Hit Points: 10d10+60
Speed:
30 ft
Saving Throws: Dex +6, Con +10, Wis +8
Skills: Perception +8, Insight +8
Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities: charmed, exhaustion, frightened
Senses: Truesight 60 ft., Passive Perception 18
Languages: Common, Abyssal, telepathy 120 ft.
Challenge Rating: 10
( 5900 XP)
Aura of Dread: The Heart Sentinel emits a 30-foot radius aura of terror. Any creature that starts its turn within the aura must succeed on a DC 16 Wisdom saving throw or be frightened until the start of its next turn.
Magic Resistance: The Heart Sentinel has advantage on saving throws against spells and other magical effects.
Regenerative Heartbeat: At the start of each of its turns, the Heart Sentinel regains 10 hit points.
Actions
Multiattack: The Heart Sentinel makes three attacks: one with its Bite and two with its Claws.
Bite: Melee Weapon Attack: +9 to hit, reach 5 ft., one creature. Hit: 17 (2d10 + 6) piercing damage.
Claw: Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 13 (2d6 + 6) slashing damage.
Heart Pulse (Recharge 5-6): The Heart Sentinel releases a shockwave of dark energy. Each creature within 30 feet of the Sentinel must make a DC 16 Constitution saving throw, taking 22 (4d10) necrotic damage on a failed save, or half as much damage on a successful one.
Legendary Actions
Claw Attack: The Heart Sentinel makes one claw attack.
Move: The Heart Sentinel moves up to half its speed without provoking opportunity attacks.
Heartbeat (Costs 2 Actions): The Heart Sentinel uses its Regenerative Heartbeat, regaining hit points immediately.
The Heart Sentinel is a towering and imposing figure, exuding an aura of ominous power and dark majesty. Its form is a nightmarish blend of shadow and substance, with a massive, humanoid shape that seems to absorb light, making its exact contours difficult to discern. The Sentinel's skin has a texture akin to dark, leathery hide, stretched taut over a powerful, muscular frame.
Its head is featureless save for two glowing red eyes, devoid of pupils, that burn like coals in the darkness. These eyes seem to pierce through to the very soul, radiating a sense of dread and foreboding. The Sentinel's mouth is a jagged maw, filled with rows of razor-sharp, metallic teeth that glint ominously in the dim light of the chamber.
Adorning its body are pulsating veins of a luminous, eerie energy that trace along its limbs and torso, converging at the chest where a large, exposed heart glows with a malevolent light. This heart beats with a rhythmic, thunderous cadence, each pulse sending ripples of dark energy coursing through the Sentinel's form and into the surrounding air.
The Heart Sentinel's arms end in long, clawed hands, capable of swift and devastating strikes. These claws seem to be made of a substance darker than night, tearing through the air with a sound that chills the blood.
Enveloping the Sentinel is a palpable aura of terror, a suffocating presence that threatens to overwhelm even the bravest of souls. The air around it is heavy with the scent of ozone and fear, and the ground beneath its feet seems to darken and wither with its every step.
In motion, the Heart Sentinel is both graceful and terrifying, moving with a predatory elegance that belies its size. Its movements are unnervingly silent, adding an ethereal quality to its already daunting presence.
In battle, the Heart Sentinel is a force of unrelenting terror, striking with precision and power. Its heartbeat resonates in the chamber, a constant reminder of the dark power that animates this fearsome guardian of The Heart of Darkness.
