Universal Monster Rule

The creature sees in all directions at once and cannot be flanked.

Body is malleable and shapeless; immune to precision damage (such as sneak attacks) and critical hits.

Creatures with this special quality have the aquatic subtype, but they can survive indefinitely on land.

The creature automatically latches onto its target when it successfully makes the listed attack.

A creature with this ability causes wounds that continue to bleed, dealing the listed damage each round at the start of the affected creature's turn.

Using nonvisual senses (sound, vibration, scent), the creature notices and pinpoints things it cannot see within the specified range.

Using nonvisual senses, the creature maneuvers and fights as effectively as a sighted creature within the specified range, ignoring invisibility and darkness.

The creature drains blood at the end of its turn if it grapples a foe, inflicting Constitution damage.

When the creature takes damage in combat, on its next turn it can fly into a rage as a free action, gaining +2 Constitution and +2 Strength but taking a –2 penalty to its AC.

Some creatures can exhale a cone, line, or cloud of energy or other magical effects.

A creature with the burn special attack deals fire damage in addition to damage dealt on a successful hit in melee.

A creature affected by the burn ability must succeed at a Reflex save (DC 10 + 1/2 the attacking creature's racial HD + its Con modifier) or catch fire.

A creature with this special quality can attempt to capsize a boat or a ship by ramming it as a charge attack and making a combat maneuver check.

A creature with this special quality has the ability to assume the appearance of a specific creature or type of creature (usually a humanoid), but retains most of its own physical...

A creature with channel resistance (usually an undead) adds the listed bonus on saves made to resist the effects of channel energy.

The creature can move through an area as small as one-quarter its space without squeezing or one-eighth its space when squeezing.

A creature with this special attack can crush an opponent, dealing bludgeoning damage, when it makes a successful grapple check (in addition to any other effects caused by a...

Constructs are immune to death effects, disease, mind-affecting effects, necromancy effects, paralysis, poison, sleep, stun, ability damage/drain, fatigue, exhaustion, energy drain, and nonlethal damage.

A creature with this ability bestows a curse upon its enemies.

A natural lycanthrope's bite attack in animal or hybrid form infects a humanoid target with lycanthropy (Fortitude DC 15 negates).

Ignores damage from physical attacks unless bypassed by the specified material, alignment, or magic weapon property.

A creature with this ability causes disease in those it contacts.

A creature with this ability can nauseate the creatures that it damages.

When the creature burrows, it can pass through stone, dirt, or almost any other sort of earth except metal as easily as a fish swims through water.