You open a conduit to the Plane of Shadow, drawing its elements into the world and igniting a black fire on the ground.

You create a shapeable shadowy curtain of black flame that covers the affected squares. The fire deals 1d6 points of cold damage per two caster levels to any creature standing in an affected square at the beginning of each of your turns until the effect ends. In addition, the flame deals damage to any creature entering or passing through an affected square. Black fire burns only a few feet tall, so a creature can avoid the effect of the mystery by jumping or flying over the area.