Weighted Damage
As detailed in Chapter 10: Combat, each weapon a character can use to make a Damage Roll includes a Weighted Damage score. To calculate this score for a creature and one of its weapons, add together the Muscle, Might, and Harm (ranged weaponry with a firing mechanism excludes Muscle and Might). Locate the row for this sum using the first column in the below table, then locate the column that corresponds to the creature's Size. The value listed at the intersection of the row and column is the creature's Weighted Damage for this weapon.
For example, Grek is Size 1, with 7 points in Muscle, 4 ranks in Might, and a woodcutting axe which has a Harm of 8. The sum of Muscle, Might, and Harm is 19. For a Size 1 creature, the Weighted Damage is +4. Grek also has a shortbow, but since this is a ranged weapon with a firing mechanism, he cannot include Muscle and Might in the sum used to calculate the Weighted Damage. The Harm of a shortbow is 10, so the Weighted Damage for this weapon is only +2.
This table can also be used when a creature wields a weapon made for a creature of a different Size. For example, Tolgo is a firnoy and is Size −1. Having lost his trusty kitchen knife, he scans the battlefield for anything sharp to wield. He swipes a fallen kulgeri's combat knife, which has a Harm of 3. The table below indicates that a score of 3 at Size 1 grants a Weighted Damage of +1. Tolgo's Weighted Damage score is +1 with this weapon, as it's bigger than a combat knife made for a firnoy.