As soon as she put the necklace on, Ondrea could feel a pleasant warmth spreading through her body, making her feel rested and rejuvenated, as if she had just had a long rest and a full meal.  The warmth continued to grow as she gathered the rest of the thieves' belongings, but as she started to leave she felt a chill down her spine.  Suddenly, the warmth was replaced with an icy dread, and she felt a weight around her neck.  The necklace was gone, and in its place was a solid collar of cold metal, seamless without any hinge or keyhole to be found.  Worse, engraved along the front of the collar, she could feel a word, written in an ancient language she could somehow understand: Slave.