Xanas come from Asturian folklore. They're said to be beautiful slender creatures who live by rivers, waterfalls, or forests. They look like a human woman, but can't produce milk, so when they have a baby they trade it for a human child. You can tell your baby was traded for a xana changeling if it grows up in a handful of months. Xanas also sing, and the pure in heart who hear them feel incredible peace. The not-so-pure-in-heart...well, they feel like they're being smothered, and might go insane.