If I had a Goblin with the Burn, Burn, Burn! feat, how would that interact with coating my weapon in a flammable substance ala Thoros of Myr or shooting fire arrows?
Is there a rule set for those actions?
Can you find an alchemical or nonmagical source (from Paizo) to add such damage to your weapons? I couldn't by looking on d20pfsrd for a few minutes, but that is not necessarily a conclusive search.
I can say, that battle poi are a weapon that deal only fire damage and are from Adventurer's Armory. The feat should work with that weapon to deal extra fire damage.
How about dropping a vial of alchemical fire on a fire-forged steel sword?
Reference Links:
Burn! Burn! Burn! feat.
Thoros of Myr Game of Thrones character
Fire forged Steel special material
How about dropping a vial of alchemical fire on a fire-forged steel sword?
That should probably work, if you have a way of making alchemist fire deal 10 points of damage instead of the normal 1d6 they deal. I think the only way is to be an alchemist, because you can add your int modifier to the damage with alchemical weapons if I recall correctly.