Artifacts is a 2007 horror film directed by Giles Daoust and Emmanuel Jespers and starring Mary Stockley and Felix Scott.
One night after falling asleep she dreams of one of her friends being thrown from a building by an unseen assailant.
One by one Kate's friends are hunted downed and killed with strange 'artifacts' removed from their bodies by their attackers.
[1] DVD Talk praised the film, noting good acting and a "compelling" unbloated plot while criticising its open-ended ambiguous ending, and rated it "highly recommended".
[4] Cinema Fantastique gave it 2/5, finding the scenario simplistic and the film direction repetitive.