Arals Thatira
While many in the cult have become enraptured with Seanan‘s silver supplements, Arals instead opted for the healing Power of the Atom. It’s more likely that it is the beneficence of Slaanesh that has kept him alive than a misreading of some Dark Age lore books. Arals isn’t concerned with other’s doubt, and not being the brightest he sees no issues with worshiping both Slaanesh and the Atom. It is a little unfortunate that the hideous orange tan, and slight glow makes him a bit of a target, but it is a testament to some ruinous power that despite this he still has not been struck down.
Arals claims is knife was licked clean by a Keeper of Secrets in the aftermath of a raid, but everyone who was at that battle was otherwise occupied in the post battle orgy to corroborate his story.