From Pathfinder Beginner Box: Secrets of the Unlit Star, which isn't enabled.

Smoking Sword

ITEM 3

FIRE MAGICAL VERSATILE-P

Price 60 gp

Usage held in 1 hand

Bulk 1

Category martial

Group sword

Damage 1d8 slashing

Smoke constantly belches from this +1 magic longsword. Any successful Strike with this sword deals 1 extra fire damage. You can use a special action to make the blade's edges light on fire.

Activate—Stoke Flames (concentrate)

Until the end of your turn, the blade deals 1d6 extra fire damage instead of just 1. After you use this action, you can't use it again for 10 minutes.

Pathfinder Beginner Box: Secrets of the Unlit StarORC