Tau Phosphoros, archbishop and Patriarch of the Apostolic Church of the Pleroma, examines in detail the principal liturgy of the ACP. This is both a practical manual and theoretical exegesis, giving detailed instruction for the celebration of the liturgy as well as delving into the philosophical, theological, and occult bases of this ceremony, described by Tau Phosphoros as a rite of High Theurgy. While intended primarily for ACP clergy, this work will be appreciated by all ecclesiastical Gnostics, Liberal Catholics, and those of the Independent Sacramental Movement who are looking to study the esoteric foundation of the Eucharistic Mass.