This blade belongs to one of the 10 ancient Ash Keepers of the Caldera.
While attuned to this blade, the user is resistant to fire damage. You can use a bonus action to cause small flames to lick the blade and make it appear partially molten. While the sword is molten, it deals an extra 2d8 fire damage to any target it hits. These flames shed bright light in a 10-foot radius and dim light for an additional 20 feet. The flames last until you use a bonus action or until you drop or sheathe the sword.
While attuned to this blade, add the Control Flames cantrip to your spell list. You can cast it as a bonus action. As an action, once per long rest, the user can drag the tip of the blade along the ground and cast firewall in the direction of their choosing.
Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Sap. If you hit a creature with this weapon, that creature has Disadvantage on its next attack roll before the start of your next turn.
Notes: Damage: Fire, Resistance: Fire, Damage, Combat, Versatile, Sap