Soulbound Automaton

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Medium Construct, Lawful Evil

Armor Class 16 (plate armor)

Hit Points 65 (10d8+20)

Speed 30 ft.

STR 18 (+4)

DEX 12 (+1)

CON 14 (+2)

INT 1 (-5)

WIS 1 (-5)

CHA 1 (-5)

Saving Throws Con +5

Skills Perception +2, Investigation +4

Damage Vulnerabilities radiant

Damage Resistances bludgeoning; piercing; slashing from nonmagical attacks

Damage Immunities poison, psychic

Condition Immunities charmed, frightened, paralyzed, poisoned

Senses darkvision 60 ft., passive Perception 12

Languages Primordial

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

Soul Harvest. When the Soulbound Automaton reduces a creature to 0 hit points, it gains temporary hit points equal to the slain creature's hit points.

Arcane Vitality. When the Soulbound Automaton is reduced to half its hit points or fewer, it gains a +2 bonus to damage rolls.

Actions

Multiattack. The Soulbound Automaton makes two melee attacks.

Soul Blade. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 15 (2d10+4) slashing damage. The Soul Blade is infused with the essence of captured souls, dealing an additional 1d6 necrotic damage.

Soul Surge (Recharge 5-6). The Soulbound Automaton channels the souls within, unleashing a wave of energy in a 15-foot cone. Each creature in that area must make a DC 15 Constitution saving throw, taking 27 (6d8) necrotic damage on a failed save, or half as much on a successful one.

Reactions

Defensive Thrum. When targeted by an attack, the Soulbound Automaton can use its reaction to raise its defenses, adding +2 to its AC until the start of its next turn.

Environment Urban, Underdark

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Lore & Description

Appearance

The Soulbound Automaton is a towering figure clad in dark steel, its body adorned with intricate runes that flicker with a chilling blue light. Within its hollow eyes, swirling shades of lost souls can be seen, their whispers echoing around it, amplifying its ghostly presence. Its hands are elongated, with fingers that end in sharp, gleaming blades, ready to harvest the life essence of its foes.

Behavior & Origins

Created by a malevolent artificer who sought to harness the power of souls, the Soulbound Automaton serves as a relentless enforcer of its master’s will. It is said that each time it slays a creature, the essence of that life is absorbed into the automaton, fueling its unholy purpose. It targets the weak and the unsuspecting, often laying in wait in dark alleys or abandoned ruins, striking fear into the hearts of those who dare to tread in its domain.

Monster Image

Generation Info

Original prompt:
"A magical automaton powered by souls"

Created: Jan 28, 2026
Modified: Jun 1, 2026