It has a very large blade, with runes inscribed along the center of the blade on both sides. When the command word: "Aether" is spoken as a bonus action, these runes light up with a light blue glow, causing similarly colored flames to erupt from the blade. These flames shed bright light in a 40-foot radius and dim light for an additional 40 feet. While the sword is ablaze, it deals an extra 3d6 fire damage to any target it hits. The flames last until a bonus action is used to speak the command word again, or until the sword is dropped or sheathed.
Proficiency with a Greatsword 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.
Graze. If your attack roll with this weapon misses a creature, you can deal damage to that creature equal to the ability modifier you used to make the attack roll. This damage is the same type dealt by the weapon, and the damage can be increased only by increasing the ability modifier.
Notes: Damage: Fire, Great Weapon Master, Damage, Combat, Heavy, Two-Handed, Graze