No, I think that part was their own invention. I talked to the leader of the werewolves about it, it's basically that they take 'shrooms and shit to have visions. He said the stuff they use is too strong for humans, or at least the native humans.

[ Which had not been surprising to Julie, given the sheer number of bodies she'd see in the visions. She'd given her own theory about why the Summoned weren't immediately dying from the ceremony to Sten, but in the end, she can't really say if she's right.

She places her palm back on his forehead as she notices his continued discomfort. Not knowing how this healing shit works, all she can do is sort of focus the warm energy through her hand, until her skin tingles like pins and needles. ]

Luckily, I don't think it works like that here. Doesn't seem like bein' a werewolf or a vampire is contagious in Abraxas. So just bunch of poisoned cultists. Still not a good thing to claim.