Objects are immune to subdual damage. Animated objects are immune to critical hits because they are constructs. Divide the damage by 2 before applying the object's hardness. Energy Attacks Objects take half damage from acid, fire, and lightning attacks. Divide the damage by 2 before applying the hardness.
Sonic attacks deal full damage to objects.
The DM may determine that certain weapons just can't deal damage effectively to certain objects. For example, a combatant will have a hard time chopping down a door by shooting arrows at it or cutting a rope with a club. The DM may rule that certain attacks are especially successful against some objects. For example, it's easy to light a curtain on fire or rip up a scroll. Whenever an object takes damage, subtract its hardness from the damage.