Oathbreaker's Requiem
Forged at the height of the Valdremian Succession Wars, this blade was the centerpiece of a peace treaty ceremony, then driven through the heart of the emissary who held it by the lord who commissioned its making. The sword remembers every oath spoken near it since that day, cataloguing betrayals across centuries. Those who wield it find it a merciless instrument of justice against the faithless, even as it holds them to a standard they never agreed to meet.
Mechanics
A blade of ancient oaths that grows more lethal against foes who have broken a vow, but its curse slowly unmakes the wielder's own promises.
Weight of Broken Oaths
This longsword deals an extra 2d6 necrotic damage on a hit against any creature that has broken a vow, sworn oath, or binding compact, as adjudicated by the DM based on the creature's history. This includes creatures under compulsion effects they have violated, those who have betrayed formal alliances, or any creature the DM determines has meaningfully broken a promise. The blade turns the color of tarnished silver when such a creature is within 30 feet, providing no specific information beyond the signal.
Undying Verdict
Once per long rest, when you reduce a creature to 0 hit points with this weapon, you can speak a declaration of judgment, a single sentence condemning the creature. Until the next dawn, you have advantage on death saving throws, as though the sword is honoring the finality of your sentence.
Curse of the Unraveling Word
This weapon is cursed with the memory of a compact shattered in a war long ended. The curse activates the first time you attune to the sword and strike a creature in combat, a cold numbness settles into your throat, as though your words are being weighed. While cursed, any oath, promise, or formal agreement you make is magically binding: if you knowingly act against a promise made after attuning to this weapon, you immediately take 2d10 psychic damage and suffer disadvantage on Charisma-based skill checks for 24 hours. The curse cannot be removed by Remove Curse or similar magic of 3rd level or lower; only a Break Enchantment effect or a 4th-level or higher Dispel Magic cast directly on the attuned wielder ends it. Removing the sword's attunement does not lift the curse, it persists until dispelled.
DM Notes
Balance consideration: the 2d8 necrotic bonus is conditional on the DM adjudicating whether a target has 'broken an oath,' which gives the DM meaningful narrative control. Keep this trigger rare but satisfying, most bandits and monsters won't qualify, but cult leaders, corrupt knights, or treacherous nobles are excellent candidates. The tarnished silver glow provides a useful signal without over-informing players. The curse is the item's primary tension: it punishes casual promise-making, which creates excellent roleplay pressure without causing catastrophic mechanical harm. The 2d10 psychic damage and disadvantage on Charisma checks for 24 hours is punishing but survivable, it rewards players who take oaths seriously rather than punishing them out of the game. The dispel threshold (4th level or higher) is important; don't let a 3rd-level Remove Curse trivially end it mid-campaign. Consider having NPCs notice when the blade glows and react accordingly, it can serve as a lie detector in social encounters, which rewards creative use.
Generated with: Level 5 · Cursed ancient theme · Heroic · Rare