Looks like double double toil and trouble for former Stanford University swimmer Brock Turner.

Turner, who was convicted of sexually assaulting an unconscious woman, was sentenced to six months in prison and three years' probation, a sentence that has been criticized as too lenient.

A group of witches felt similarly.

Melanie Hexen, a bellydancer and midwife who identifies as a traditional hereditary witch, organized a mass hexing of Turner on Tuesday. She posted the hexing as an event on Facebook and invited her 12 coven sisters, with whom she decided to perform the hex and publicize it on the social media platform.

Before she knew it, the event had expanded with more than 1,000 people invited.

"I think it really struck a chord with a lot of women as a way to feel like they had some power in this situation," Hexen told U.S. News. "That there was something they could do, some way they could come together and focus their rage and their need for justice that wasn’t being met.”

“Witches doing spells in times when they’re otherwise powerless goes back thousands of years,” she added.

Hexen posted a sample of a hex on the Facebook event Tuesday night, which includes the requirements for the spell and what to say.

"Brock Allen Turner we hex you," the sample reads. "You will be impotent. You will know constant pain of pine needles in your guts. Food will bring you no sustenance. In water, your lungs will fail you. Sleep will only bring nightmares. Shame will be your mantle. You will meet justice."

Though the nature of the hex was vitriolic, Hexen said she has no concerns about "any Rule of Three or magical backlash."

"There was a lot of anger sent to Brock Turner and to the judge [Aaron Persky]," Hexen said to U.S. News. "However, there was also very much healing and love poured out amongst the women in the group ... and much love and healing poured out to Brock Turner’s victim."

Will the spell work? Hexen is certain of it. "I’m a really experienced, powerful witch," she said. "I have no doubt that when I cast a hex, it will be successful.”