Shadow People are evil spirits that reside in the Boundary and rifts to the Underword. They lure unsupecting victums by takeing the form of dead loved ones so they can get close enough for the shadow people to drag them to the underworld.Shadow People can only be killed by Wizards fire.
Trivia
Though the second season of Legend of the Seeker is primarly Richard and friends battling the Keeper of the Underworld and the undead, the Shadow People strangly do not appear in the season despite Multiple Rifts to the underworld being shown.
The screams of Shadow People can kill any living thing in earshot and can be harnesed into a time bomb called a whisperer.