Fractured Flame Tongue
Weapon (any sword), uncommon (requires attunement)
This ancient sword is deeply weathered and its flame tongue enchantment has corroded the blade from within.
You can use a bonus action to speak this magic sword's command word, causing meager flames to erupt from the blade. These flames shed bright light in a 10-foot radius and dim light for an additional 10 feet. While the sword is ablaze, it deals an extra 1d6 fire damage to any target it hits. The flames last until you use a bonus action to speak the command word again or until you drop or sheathe the sword. Roll a d20 each time you ignite the sword. On a 1, the fire sputters out and the sword permanently loses its magic. On a 20, the flames roar brilliantly for 1 minute, shedding bright light in a 100-foot radius and dim light for an additional 100 feet. The first time you hit a target with the sword within that period, the sword deals an extra 2d6 fire damage (for a total of 3d6) to the target and then the flames go out.