When you were younger you suffered a brush with death. Perhaps you were almost killed by a wight, close to dying from a grievous wound, or actually died and were raised. Since then you have not been the same. You can see beyond the veil, able to see ghost and spirits and detect the taint of the undead.
Benefit: You receive a +2 trait bonus to Perception checks when trying to locate undead, and can attempt to locate ethereal undead (though they are still considered merely invisible, +20 to Stealth).