Immunity to Nonlethal

Another exception is immunity to the nonlethal trait. If you're immune to nonlethal, you're immune to all damage from attacks and effects with the nonlethal trait, no matter what other type the damage has. For instance, a typical construct has immunity to nonlethal attacks. No matter how hard you hit it with your fist, you're not going to damage it. You can take a penalty to remove the nonlethal trait from your fist, and some abilities give you unarmed attacks without the nonlethal trait.