"She's a breeder matriarch with strong feelings about who may have control of her descendants. Her colony has been a subsidiary of the Queenscourt for a very long time because it sits near a few Queenscourt locations, and anytime someone takes a stonecrusher as a vassal - that's the name of the kind - Grandmother Stone finds that person and endeavours to make them forget the stonecrusher's name. It became necessary to absorb her so that she would stop interfering with peripheral members of the Queenscourt. If she ever gains enough favour for the Queen to allow her out on an expedition in search of escaped stonecrushers, this is one of the directions she might go, and if Thorn were to capture one of her scouts she would certainly dissolve his court and might also write down his name; Grandmother Stone's Book is an infamous repository of her descendants and people who have annoyed her by trying to steal them."