Errant

Walking a liminal path that others fear to tread and see. The Errant are born of unions between mortal blood and spiritual essence.
-Sylvia Calaenia, The Cimmerian Archives

Supposedly, Errants were created in order to bridge a gap between life and death. They are the spawn of Spirits. There are many different types of Errants, like the Xin'Raki who consider themselves to be a completely separate race.