"If someone has the strength to survive it-like your sister-they are perfect candidates for belonging. They'll be strong enough to act as hosts for the immature spirits, and when it comes time for their own possession, the chances are excellent that the merge will be good. They'll retain their own physical form, but gain the powers of the Ichneuman Wasp spirit-the truest form of belonging. Don't you understand?" he went on earnestly. "We can't offer belonging to just anyone, we have to seek out the best candidates. I found the perfect way in 2XS."