Stone Guardian
Shaped to look like Mechanicals (the Divine Servitors of the Tinker), Stone Guardians are just one of the types of construct used by House Mason to guard the Mason Foundry.
Special Abilities
Stone Guardians can permanently See Invisibility as per the spell.
Disease
Mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects)
Necromancy effects
Paralysis
Poison
Sleep
Stun
Any effect that requires a Fortitude save (unless the effect also works on objects, or is harmless).
Note: Constructs are not subject to nonlethal damage, ability damage, ability drain, fatigue, exhaustion, or energy drain.
Constructs are not at risk of death from massive damage.