Mistwalkers are a pretty mysterious lot, and they like to keep it that way. Fortunately, I've met a couple in my time who have shared some of their experiences with me. Mistwalking is, of course, the most prestigious of the thirteen Seer gifts, but it's not one you pick. Instead, every Seer family gives their second child to the Mistwalker Council. This is so common that in Seer hospitals, doctors the doctor will just call the nearest Mistwalker school when a woman has her second child. Then they keep the baby in the hospital until someone can pick it up. Most of the time, the parents don't even see the kid. It's supposed to keep everyone from getting attaching (even the kid, apparently.)
THe Mistwalker schools are usually separated from the Seer communities. They may be a short drive away, but they think it's important to be isolated. And they need a big patch of wilderness for the initiation. Mistwalkers are raised to be loyal first to the Mistwalker Council. Oh, they tell the kids they're all the second child, and thus they were chosen for this prestigious postion, yadda yadda, but they're not supposed to consider anyone but the other Mistwalkers family. They're even all given the last name Walker, just to reinforce that.