A former Nxivm recruiter who spent 12 years in the depraved sex cult has written a new tell-all book about the group — describing in harrowing detail the moment she was physically branded.

Actress Sarah Edmondson went public with her story in October 2017 — prompting the arrest and trial of twisted leader Keith Raniere, who was convicted in June on charges of forced labor and sex trafficking.

In her new book, “Scarred,” Edmondson reveals how she was recruited by filmmaker Mark Vicente while on a cruise in 2005 — eventually being tricked into joining the alleged sex slave subgroup known as DOS, where women were branded like cattle with Raniere’s initials.

In an interview with “The Dr. Oz Show” on Tuesday, the Canadian woman also described how she was vulnerable and searching for meaning when she was reeled into the group.

“I’m an actress but it’s not fulfilling me in the way I thought it would,” Edmondson told host Mehmet Oz. “I ended up at a film festival on a cruise.”

On the cruise, she and her then-boyfriend met Vicente, who also happened to be a senior Nxivm cult member.

“He was very kind and welcoming to my boyfriend and I at the time,” Edmondson said. “I said, ‘Whatever you’re doing, whatever you’re up to, I want to be a part of it.'”

“He’s like, ‘Well actually, there’s this group of people and we’re all humanitarians and we’re changing the world,'” she said.

“I said, ‘That sounds incredible’ … How wrong was I?” she told Oz.

In the first pages of “Scarred,” Edmondson describes in gory detail how she held down another victim’s legs while she was branded in the March 2017 ceremony.

“When the iron first makes contact to her skin, Gabriella’s whole body flips and tweaks, as if she’s being electrocuted. She screams out in pain,” Edmondson wrote, claiming recruits were tricked and told they’d be getting a small tattoo, the size of a dime.

“Above her surgical mask, the woman holding her other foot meets my eyes, a distinct transaction between us: What in the actual f—?!” she wrote. “The smell of scorched skin filters through the mask, into my nose, to my stomach.”

Raniere, 56, is scheduled to be sentenced on Sept. 25. He faces a minimum prison term of 15 years and a possible life sentence.