Demon Weapon (5e Race)

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Demon Weapon

Physical Description

Demon Weapons, or living weapons—are born with both humanoid form and the innate ability to transform into a weapon. While their physiology mirrors that of humans or elves, subtle traits often reflect their weapon nature. Metallic tones may shine in their hair or skin. Eyes may glint like polished steel. Their voice might carry a resonant hum like a blade leaving its sheath.

Clothing tends to warp around their soul’s visual expression: a halberd-weapon may favor sharp lines and asymmetry, while a flail-weapon may carry spiked or weighted accessories without meaning to. These unique characteristics make Demon Weapons unmistakably other—some captivate with confidence and flare, while others become pariahs for their uncanny presence.

History

The first Demon Weapons were created through forbidden soul-binding rites—arcane experiments that fused a mortal’s soul with the essence of a fiend, elemental, or restless spirit. The result was a being capable of transforming into a weapon, feeding on souls, and growing in strength through battle and violence.

Over the centuries, some of these hybrids passed their essence to descendants, while others were replicated through dangerous magical experimentation. Today’s Demon Weapons often carry a diluted but potent legacy, each one a living weapon with a soul of its own.

By nature, a Demon Weapon’s soul is unstable, teetering between sentience and savagery. They can sync with any willing wielder, granting them access to a powerful, living weapon. However, without emotional balance and a shared rhythm, this bond is shallow—limited in potential and prone to instability.

True power lies in resonance. When a Demon Weapon bonds with a Meister—a trained or innately compatible wielder capable of aligning their soul wavelengths—a deeper connection is forged. Through this bond, the two can synchronize in battle, unleash soul-based techniques, and maintain control over the weapon’s hunger. Without this harmony, Demon Weapons risk losing themselves to madness or evolving into a Kishin, a twisted being born of corrupted souls and unchecked violence.

While anyone can lift a Demon Weapon, only a Meister can bring out their true potential.

Society

Most Demon Weapons live in scattered clans, family lineages, or hidden societies. Some integrate into broader communities, especially those accustomed to magical or extraplanar ancestry. However, their dual nature—both person and weapon—often makes trust difficult to earn.

Demon Weapon culture emphasizes resonance, balance, and bonding. A bond with a trained wielder, called a Meister, allows them to channel their full potential safely. Some communities train both Weapon and Meister together from a young age, forging partnerships that last a lifetime.

To prevent tragedy, many kingdoms or orders support Resonance Academies—places of martial and spiritual training where Meisters and Demon Weapons are paired, trained, and tested. This ensures stability and helps avoid the rise of rogue Weapons, whose hunger for souls could corrupt them into world-threatening horrors.

Where others see dangerous anomalies, some see heroes. In the hands of a Meister they trust, a Demon Weapon is more than a blade—they’re a force of will, discipline, and soul.

Demon Weapon Traits

Living weapons with souls, capable of transforming into deadly armaments. Ability Score Increase. Your Dexterity score increases by 2, and you choose either Strength or Charisma to increase by 1. Age. Demon Weapons are ageless. They do not age past physical maturity and can live indefinitely unless destroyed. Alignment. Like humans, Demon Weapons do not lean strongly toward good or evil, but tend toward lawful alignments due to their innate tendency to bond, follow structure, and act in harmony with others. Size. Demon Weapons vary widely in height and build, from just under 5 feet to over 6 feet tall. Your size is Medium. Speed. Your base walking speed is 30 feet.

Darkvision. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.

Weapon Transformation. At character creation, choose one weapon you are proficient with, subject to your DM’s approval. This becomes your Soul Weapon, reflecting the shape of your true weapon form. As a bonus action, you can transform either partially or fully into your Soul Weapon, using the base weapon/item stat block. You can revert to your humanoid form as a bonus action, or if you fall unconscious. Partial Transformation. You may transform one or both arms into your Soul Weapon. While partially transformed, you retain full control of your body and can act normally. This form lasts until you choose to end it, are incapacitated, or fully transform. Full Transformation. You fully transform into your Soul Weapon. While in this form: You are incapacitated and cannot take actions or move unless special features state otherwise. You retain your senses (such as sight and hearing) and can speak or understand languages. You may remain in weapon form indefinitely. You automatically revert to your humanoid form if you fall unconscious or drop to 0 hit points.

Basic Sync. Even without a Meister, you are still a weapon with a soul. You can sync with any willing creature wielding you. While wielded by a willing creature: The wielder gains proficiency with you if they aren’t already proficient. They gain a +1 bonus to attack and damage rolls with you. This bonus increases by +1 at 4th, 12th, and 19th character levels. You can communicate telepathically with your wielder within 30 feet. The wielder may use your Dexterity modifier for attack rolls with your weapon form if it is higher than their own. You cannot use Soul Resonance or other advanced features unless bonded with a creature who has the Meister subclass.

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Languages. You can speak, read, and write Common and one other language of your choice.

Soul Sync (Meister Only)

When you and a creature with the Meister subclass complete a long rest together, you may form a Soul Bond. This bond can only exist with one creature at a time and ends if either of you falls unconscious or ends it willingly. While wielded by your bonded Meister:

• You can communicate telepathically within 100 feet.
• You and your Meister both gain advantage on initiative rolls.
• Your Meister may always use your Dexterity modifier for attack rolls with your weapon form.
• You gain access to Soul Resonance.

Soul Resonance

While wielded by your bonded Meister, you may empower your attacks with shared soul energy.

Resonance Boost. Once per turn, when your Meister hits with an attack using your weapon form, the attack deals extra radiant or force damage equal to your level.

Synchronized Strike. (1/short or long rest) When your Meister hits with an attack using your weapon form, you can trigger a powerful resonance. The target takes 2d8 + both your levels combined as extra radiant or force damage, and you choose one:

• Stagger: Target’s speed is halved until your next turn.
• Disrupt: Target has disadvantage on their next saving throw.
• Disarm: Target drops one held item of your choice.

Resonance Shield. When you or your Meister takes damage, you can use your reaction to reduce the damage by your level + proficiency bonus.

Unstable Form

If you are reduced to 0 hit points while in weapon form:

Roll a d20.

• On a 1–5, you suffer 1 level of exhaustion when you revert.
• On a 6–20, you revert to humanoid form without issue.

Soul Sight

As an action, you can perceive the souls of nearby creatures. Until the end of your next turn:

• You know the location of any creature within 30 feet (not behind total cover).
• You can sense the emotional state of those creatures. You can cast Detect Good and Evil.

You can use this feature a number of times equal to your proficiency bonus, regaining all uses after a long rest.

Suggested Characteristics

When creating a Demon Weapon character, you can use the following table of traits, ideals, bonds and flaws to help flesh out your character. Use these tables in addition to or in place of your background's characteristics.

d8	Personality Trait
1	I constantly study the souls around me, looking for patterns—strength, weakness, intent.
2	I treat my Meister, or any wielder, like royalty—they are my blade-bearer and I, their edge.
3	I speak in metaphors about souls and resonance. People rarely understand me.
4	I have a hard time distinguishing between threats and allies. Everyone feels like a potential fight.
5	I keep a mental count of every soul I've tasted. I never forget the flavor.
6	I laugh at the absurdity of life—after all, I’m both weapon and wielder.
7	Silence is comfort. I speak only when necessary, and every word is deliberate.
8	I’m fascinated by humans and mimic their behaviors poorly but earnestly.

d6	Ideal
1	Duty. I was forged to be a weapon. That is my path. (Lawful)
2	Balance. The strong must protect the weak—or risk becoming the thing they fight. (Good)
3	Power. Strength determines truth. The weak cling to ideals. (Evil)
4	Harmony. Soul resonance is the truest expression of unity. (Neutral)
5	Freedom. No one owns me—not the forge, not fate. (Chaotic)
6	Transformation. I believe that through growth and change, I’ll transcend even weaponhood. (Any)

d6	Bond
1	I once had a Meister I failed to protect. Their memory fuels my resolve.
2	My soul was reforged from something darker—I strive to keep it in check.
3	I forged a soul bond with someone long ago. Even now, I can still feel them.
4	I protect my current wielder at all costs. If they fall, I fall.
5	I was stolen from my original creator. I seek to return to them or destroy those who wronged us.
6	My greatest fear is becoming a Kishin. I will do anything to avoid it.

d6	Flaw
1	My hunger for souls never truly fades—I suppress it, but it whispers always.
2	I struggle to form bonds—what if they break or abandon me again?
3	I often treat people as tools or weapons, just as I am.
4	I act without considering collateral damage—destruction is what I was built for.
5	I secretly believe I'm not a person—just a weapon pretending to be one.
6	I would risk everything to gain power, even if it costs my soul.

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