The Warner Brothers logo looms into view as a gray iron gate. Not quite like the “No Trespassing” sign outside Charles Foster Kane’s Xanadu, but still, any unsuspecting soul who wanders into the sixth episode of this fantasy franchise without first reading the source novel by J.K. Rowling may need a wand to unveil throughlines of the ongoing mythology. Sooty aerial wraiths called Death Eaters—whose name suggests they ought to shit everlasting life—conspire to upset a school of kids learning how to wave their wands. There’s a new Professor of Defense Against the Dark Arts on the faculty, and his horny charges are brewing the equivalent of date-rape potions. The title lad (Daniel Radcliffe) wins a vial of Liquid Luck by cheating in class. Teen make-out drama offers respite from a rote plot of good wizards versus bad wizards over ancient grudges and eternal dominion. Screenwriter Steve Kloves and director David Yates shortchange fans of the inventive grandeur that charmed early Potter product. All I look forward to in the seventh film is more screen time for the lovely weirdo Luna, played by Evanna Lynch. With Jim Broadbent, Helena Bonham Carter, Robbie Coltrane, Warwick Davis, Michael Gambon, Alan Rickman, Maggie Smith, Timothy Spall, David Thewlis, Julie Walters, and the expertise of weather consultant Dr. Richard Wild. 153m. Anamorphic 2.40 widescreen. (Bill Stamets)