A creature wearing this thick necklace is automatically aware of all constructs within 60 feet as per the lifesense ability but only sensing constructs. Constructs can’t see, hear, or otherwise detect the presence of the wearer, even when using extraordinary or supernatural sensory capabilities such as blindsense, blindsight, scent, or tremorsense. If the wearer touches a construct or attacks any creature, this concealing ability ceases to function for 1 minute. Constructs with an Intelligence score of 3 or greater can attempt a DC 18 Will save to detect the wearer.
Pathfinder Campaign Setting: Construct Handbook © 2018, Paizo Inc.; Authors: Brian Duckwitz, Andrew Hoskins, Nathan King, Kris Leonard, Luis Loza, Adrian Ng, Tom Phillips, Alex Riggs, and Nicholas Wasko.