There's something about a post-millennium album cover that features a giant blue-horned minion of Satan in pre-pounce with an illuminated crystal ball in its leathery hand that simply warms the soul, and the fact that it adorns a record called Master of the Moon can mean only one thing: Dio. Unlike many in the aging metal community, Ronnie James Dio still possesses the same powerful voice that fueled the genre through its late-'70s and '80s heydays, and the reigning dark prince of Elfdom and two-time Black Sabbath frontman is still capable of writing a killer song or two. MOTM resembles earlier works like Last in Line and Sacred Heart in its ability to buffer those one or two great tracks with seven or eight forgettable ones. Luckily, it's the first one out of the gate, "One More for the Road," that packs the biggest wallop…