The Pfhor had previously been forced to use the trih xeem when the Nakh (the last extant client race of the Jjaro) rebelled six thousand years before the end of Marathon 2, as well as a rebellion by the Drinniol. Much of the Marathon Infinity story revolves around preventing the Pfhor from using the tri xeem and inadvertently releasing a W'rkncacnter that is supposedly trapped within the Lh'owon sun.