Size Damage is a special multiplier where a smaller opponent is able to deal extra damage to a larger one, usually after scoring a Critical Hit from an Attack Roll, or through the use of special equipment or Metaphors.
Size Damage Multiplier
To deal Size Damage by any means, one can score a Critical Hit by rolling a 12 on a d12 during an Attack roll. They can use the result of the exploded Meta-die's Versatile Bonus to declare a precision attack against a giant-sized foe. The attack is treated as being a Size equal to that die's result for the purpose of calculating damage to the giant target, but only up to the target's actual Size-Rating minus the attacker's Size above 1. Another way to deal Size Damage is through the enhancements of Equipment or through Metaphors. If a piece of equipment specifically treats its damage as being a certain Size larger to bigger foes, then its damage is multiplied or increased by 100%. If conditions such as requiring to beat the target's Deflection need to be met before the bonus can trigger, the character must meet the condition before the damage can be modified.
Damage Limits
The Size Damage bonus can only multiply damage up to the target's Size Rating, and if the attacker is bigger than Size 1, then the maximum bonus is lowered equal to the difference between the two combatants. No matter how high the Size Damage multiplier is, a Size 1 Human can't deal more than x4 damage against a Size 4 Giant. And if a Size 2 Half-Giant attacks the same foe, they wouldn't be able to deal more than +200% damage due to the difference in their sizes. If two Giants of equal size fight, neither can gain a Size Damage bonus against the other.
Smaller Creatures
To determine the multipliers for creatures smaller than 1 (Medium):
| Size Category | Body Scale | Damage Mult | Size Damage required versus Medium |
| Small | 1/2th | 1x | - |
| Tiny | 1/4th | 0.5x | 2 |
| Diminutive | 1/8th | 0.25x | 4 |
| Fine | 1/16th | 0.125x | 8 |