On “Walk Through Exits Only,” Phil Anselmo expands his heavy-metal empire, taking over a piece of tough, guttural turf that sounds distinctly different from his previous work with Pantera, Down, and Superjoint Ritual. Credited to Philip H. Anselmo and the Illegals, “Exits” is a raw brand of battle metal full of barking vocals, squealing guitars, and martial rhythms. Within the grind of the music, Anselmo unleashes endless laments and diatribes. Despite his place among metal royalty, Anselmo remains a convincing outsider, partially because he doesn’t exclude himself from his own rants. Full story for BostonGlobe.com subscribers.