Итоги голосования для комментария:
GrayStranger
С 3 очков горят кожаные предметы, для того модификатор и взят.
Странно, в Campaigns написано с 10.

Super-Flammable (e.g., black powder, ether): Negligible damage
(candle flame).
Highly Flammable (e.g., alcohol, paper, tinder): 1 point.
Flammable (e.g., dry wood, kindling, oil): 3 points.
Resistant (e.g., seasoned wood, clothing, rope, leather): 10 points.
Highly Resistant (e.g., green wood, flesh): 30 points.
Nonflammable (e.g., brick, metal, rock, fireproof synthetics): N/A.