Flames of Dis

The Lord of Dis has used his infernal secrets to imbue your pact weapon with hellish fire, which you can invoke on the weapon in any form.

Your pact weapon gains the following ability:

You can use a Bonus Action to speak the weapon's Command word, causing flames to erupt from it. These flames shed bright light in a 40-foot radius and dim light for an additional 40 feet. While the weapon is ablaze, it deals an extra 2d6 fire damage to any target it hits. The flames last until you use a Bonus to speak the Command word again or until you dismiss your pact weapon.