Photo by Francis Chung Bat For Lashes certainly know how to set a mood. If the wolf howling in front of a full moon draped behind them on the 9:30 Club stage Saturday night didn’t give away their intentions to create a mystical night, the glitter, lights and feathers adorning the stage (and lead singer Natasha Khan) pushed the point home. And that was before Khan even opened her mouth. Her ethereal, chilling voice…