Damage Modifiers (Type of Material)

Injury to Unliving, Homogenous, and Diffuse Targets
The Wounding Modifiers and Injury rules assume a human, animal, or other ordinary living being. Machines, corporeal undead, swarms, and other unusual entities are much less vulnerable to certain damage types:

Unliving:
Machines and anyone with Injury Tolerance (Unliving) (p. 60), such as most corporeal undead, are less vulnerable to impaling and piercing damage. This gives impaling and huge piercing a wounding modifier of x1; large piercing, x1/2; piercing, x1/3; and small piercing, x1/5.

Homogenous:
Things that lack vulnerable internal parts or mechanisms – such as uniformly solid or hollow objects (e.g., melee weapons, shields, and furniture), unpowered vehicles, trees, and walls – are even less vulnerable! This includes animated statues, blobs, and anything else with Injury Tolerance (Homogenous). Impaling and huge piercing have a wounding modifier of x1/2; large piercing, x1/3; piercing, x1/5; and small piercing, x1/10.

Diffuse:
A target with Injury Tolerance (Diffuse) is even harder to damage! This includes swarms, air elementals, nets, etc. Impaling and piercing attacks (of any size) never do more than 1 HP of injury, regardless of penetrating damage! Other attacks can never do more than 2 HP of injury.