Bludgeoning is a physical damage type caused by smashing an opponent with a heavy, flat or rounded surface. This type of damage can be mitigated with bludgeoning damage immunity, bludgeoning damage resistance, or general damage reduction. It is often a favored damage type of undead hunters, as skeletal undead (e.g. skeletons) tend to have 50% immunity to other physical damage types, but not to bludgeoning damage.
Weapons that cause this type of damage include: club, flail, hammer, mace, dire mace, magic staff, morningstar, quarterstaff, sling, and unarmed strike. In addition, many creatures have creature weapons (slams) that cause bludgeoning damage.
The standard items brawler's belt and greater brawler's belt provide bludgeoning damage resistance (5/- and 20/-, respectively).