"I know where it was about - five days ago. I'm also a tracker, so if I get far enough away from the necklace I can probably point us in the right direction, if we don't manage to find it from there."
He does not want to trust Sintre with his necklace alone. He'll be hiding it somewhere, thanks.
(He should probably get more people, wait. But he can't, he doesn't have time, the clock is ticking...)
They come across the place Aldaras remembers, and then they start finding corpses. Intermittently, without a mark on them, no supplies for travel, in inappropriate clothes for travel. Each one is thin and emaciated, with bleeding feet, and it's not difficult to figure out that they died of long-term exposure.
"Seems we're on the right track," sighs Aldaras.
"You should probably touch the necklace now, for safety. We might run into its radius at any time."
"All right, then. Let's keep going."
He'll keep the necklace out. For when they find any cut.
From here, they don't have a guide, but it's not like the cut are particularly subtle about where they go. A decent group of people going in the same direction at a steady pace with barely any rest through the wilderness is - pretty obvious, even to people inexperience with tracking.
They find their first cut the next day. Two people move faster than a group of shambling, emaciated cut, after all.
He touches the necklace to her arm, gently.
"Hey, it's okay," assures Aldaras. "We're here, I have an artifact that can uncut people." He produces a canteen and offers it to the poor woman. "You're free."
"... Your ankle seems to be twisted," he observes. "Do you feel any pain?"
"It's all right," assures Aldaras, again. "Okay? You're completely immune to the knife now, it's okay, you're free."
"I'll help you get home, but first we have to help the other people who are cut and - figure out what to do with the knife. Probably encase it in concrete and throw it in the ocean."