According to prosecutor Moira Penza, there will be a superseding indictment.
Mack's lawyers declined to comment.
"These were consenting adults who knew what they were doing, and approved of it", he added.
While Raniere has not been released on bail at this moment in time the judge told his defence team that they could bring a bail package for review directly to him.
Friday's listening to marked the primary time that Mack and Raniere had seen one another since his arrest this previous March in Mexico, the place they had been staying collectively in a villa in Puerto Vallarta.
Members were also forced to undergo a painful branding ceremony in which a cauterizing tool was used to carve a brand in the shape of Raniere's initials into the skin on their pelvis. Prosecutors say Mack helped Raniere recruit women to his upstate NY mentorship group NXIVM that turned them into sex slaves.
Some of the women were branded with a symbol that prosecutors said contained Raniere's initials.
Mack and Raniere face these charges due to their involvement in the NXIVM sub-group known as DOS (reportedly "Dominant Over Submissive") which utilized a pyramid structure of Slaves and Masters.More news: Rihanna Says Her Next Album Will Be a Reggae LP
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It's alleged that she starved, enslaved and branded women, while ensuring their silence with blackmail in the form of damaging information or criminal confessions the women were required to make as a condition of entry into the group. Since the arrests, more and more women have come forward, detailing the horrific abuses they were subjected to.
A judge has scheduled a trial for the pair to begin on October 1.
The 59-year-old woman dated Raniere from 1991 to '99 and was only part of his cult in its nascent stages before she got out.
Before court began, she sat on a back bench in the spectators' area of the courtroom, alternately crying and laughing with her lawyers.
"We anticipate that there will be additional charges and additional defendants in this case."As an alleged co-conspirator, she is also exposed to potential criminal liability in the case.
Another person under close scrutiny is Nancy Salzman, NXIVM's president.
Mack was released on a $5 million bail after federal prosecutors claimed she worked as a slave "master" running a sex cult called DOS that was disguised as a self-help organization.