"...an outside-the-box journey into sights and sounds from far and deep into the imagination, and a fascinating antidote to the often stultifying dearth of vision and ambition in so much rock music today." — Daniel Lukes, Lollipop

"...Secret Chiefs 3 have existed in various incarnations over the course of the past eight years, and have served as the funnel for Spruance's remarkably far-flung studies of the hermetic mysteries and musical traditions of unknown and underappreciated subgenres. Album titles like Grand Constitution and Bylaws and Book M hint at the music's vaguely metaphysical bent. Over three years in the making, Book of Horizons is Secret Chiefs' most expansive and coherent statement, an alchemical fusion of Morricone-esque cinematic grandeur, midnight surf guitar, traditional Middle Eastern rhythms and time signatures, demonic death metal, and electronic deviance that yields a work of undeniable force." — Jonathan Zwickel, Pitchfork

"Cast the clear light of alchemical truth through the graphically enhanced occult fog, and you'll find an album fluffed full of magick, mystery, and densely orchestrated mosque-rocking beats." — Richard Gehr, Village Voice