Progressive-stoner rockers Emissary have a new album out. It’s a grand venture of traversing uncharted territories in space and setting sail through shadowy oceans, all from the scope of heavy rock instrumentation. The band are epic warriors here, especially with the enduring vastness of tunes like “Stellar Cartography” and “Daedalus.” Emissary stay sharp, fierce, and determined with “Cerulean.”