Shadow of Nations Lost
All creatures native to the land of shadows are known as shadowborn; so named because they were born in the Shadowfell. The Shadowfell might reflect the mortal world, but its fundamental nature changes many mortal creatures. This change manifests as deep melancholy or anxiety, but it can grow worse, resulting in insanity, mania, and physical degeneration. Many shadowborn seem identical to their worldly counterparts, but many have abilities that reflect the influence of the Shadowfell.
Shadowborn look like their counterparts in the world, but they become paler or darker and take on a deathly aspect. Their features grow sunken and hollow, their eyes dance with shadow. Their forms sometimes appear to waver slightly, as though they are not entirely there. They exhibit behavior typical to extended exposure to the Shadowfell, ranging from nervousness to paranoia.