The Cult of B.O.B.

The Cult of B.O.B. is an organization in Daniel Kravitz, Chosen One, a segment of It's All Been Done Radio Hour. B.O.B. stands for Bertram Oswalt Babbit, the man the cult follows. They wear specific robes that are known to some outside of the sect.
One group in this cult, who was not personally being led by Bertram at the time of their appearance in the story, located the body of Josh Wallace, whom they believed Bertram's soul resided in. (Josh's own friends suspected the same.) This cult sect, led by Fran, took a bus to the place and sacrificed their member Jerry to finish the soul transference and bring Bertram back. It is unknown if they succeeded, or if they were right. They used relics, which they abandoned, and needed a living sacrifice to accomplish their task.
The surviving members of the sect, including Fran and Carter, are imprisoned on the U.L.P. ranch in Kalispell, Montana ("Cult of B.O.B."). Josh later called this group 'pretenders,' and said they weren't part of the real organization ("Ready Player Chosen One"). They eventually escaped, but were slaughtered by monsters as they fled ("With Great Power...").
A figure with similar robes was spotted at Daniel Kravitz's high school reunion. He could do magic. When trapped by Daniel and friends, he took a cyanide pill so he didn't have to speak to them ("Punch").