The Russian cult fantasy Nightwatch finally gets a sequel. Those hoping the dense mythology and dazzling action would receive a bit more explanation this go-around are setting themselves up for disappointment. This one has something to do with the continuing mystical war between the Light Others and Dark Others and a piece of chalk that's either supposed to save the world or destroy it. (I'm not real clear on that point.) Those looking for nothing more than another ultra-cool mixup of Harry Potter and The Matrix will find plenty to ogle in this eyebulb-bending epic. See the first film before you check this one out, though, or there's no hope of understanding. In Russian with English subtitles.132 minutes R.