You’ve spent enough time on fire that you know how to use it to your advantage.
You can light yourself thoroughly on fire with a held torch, a bottle of alchemist’s
fire, or a similar incendiary, dealing yourself 1d6 persistent fire damage. As
long as you are suffering persistent fire damage, all your melee attacks against
adjacent creatures deal an additional 1 fire damage per weapon damage die. Any
creature that successfully Grapples, Shoves, or Trips you takes 1d6 fire damage;
if it uses a weapon for that action, the weapon takes the damage instead. You
must still attempt the flat check to remove the persistent fire damage each
round, as normal.