[The stone itself is warm from Jamie's body heat. There doesn't seem to be anything else special about it otherwise.

Given that the spiders are just trying to live their best lives, Jamie doesn't destroy them. But he does make sure they're gone. He gets up with a quiet sigh and wanders back to the cot. He sits down next to Jon again and leans against him.]

If you start getting worried or scared or whatever, just hang onto that and think of something nice. Or me. Whichever is easier.