>>64466208
Actually the fact that the symptoms of the sickness looks like radiation poisoning makes perfect sense if Ariane is subconsciously altering reality, the sickness is basically her own fear and pain of her own death being projected onto everyone else.
Also, interesting thing I noticed on a recent playthrough, on the magazine in Rotfront that talks about the red eye, one of the characters eyes is missing. A reoccuring theme is how many characters loose their eye at some point in the game, almost like losing an eye shows that you've been "marked" by the red eye. If you buy the theory that Ariane became the red eye, it would explain why she hasn't.