This brought metahumans into NAN and the Salish-Shidhe territories in ever-increasing numbers over the years just before the establishment of the Tir. Before Bright Water disappeared (faking his death, by the way. Something I know he is quite proficient at), he encouraged the metahuman population to segregate itself into the southern region of the Amerindian territories. They did so, and this was the beginning of what would later become Tir Tairngire.