Did anyone else notice ... (SPOILERS)
I just watched this for the 3rd time, this time in great detail because I'm doing a scene by scene film analysis on it for a graduate screenwriting class.
I did not notice this in previous viewings, but the flashback to 1966 - after Nyle emerges, altered, and kills Anna, Arboria comes in and is holding baby Elena. I put subtitles on this go around too to make sure I caught all the dialogue.
Arboria says that her “mother’s absorption back into the cycle of life has not been for nothing” and that she (Elena) will be the dawning of a new era for the human race and the human soul and a new age of enlightenment.
He then dips her into the same pool of dark liquid from where Nyle emerged; her body disappears and the liquid absorbs the entire screen. So she is essentially baptised in the same pool of liquid from which Nyle gained his supposed powers. Never caught that before!
So this would explain how Elena got her powers (theoretically). Also explains (in some levels) Nyle's strange obsession and connection with her. Before he kills Rosemary, Nyle tells her that he was chosen. But, as other have speculated, I believe Nyle really thrived on ego rather than on supernatural or telepathic/telekinetic powers. Elena was actually the one "chosen" and gifted.
I've seen a lot of people discussing this on the boards. Obviously haven't read through ALL of the threads, but I haven't seen anyone else address that. Probably has already been touched on before, but I thought it was interesting.