Constructs

A construct is an animated object or an artificially constructed creature. Most are mindless. They have low-light vision and darkvision. They are immune to all mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects). They are immune to poison, sleep effects, stunning, disease, death effects, and necromancy effects.

Constructs cannot heal damage on their own, but often they can be repaired by exposing them to a certain kind of effect (varies for each creature) or through the use of the Craft Construct feat or repair spells. Constructs may still have the fast healing special quality.

Constructs are not subject to critical hits, nonlethal damage, ability damage, ability drain, fatigue, exhaustion, or energy drain. They are immune to any effect that requires a Fortitude save (unless the effect also works on objects, or is harmless). They are not at risk of death from massive damage. They are immediately destroyed when they are reduced to 0 hit points or less. Since it was never alive, a construct cannot be raised or resurrected. Constructs do not eat, sleep, or breathe.