I've got a lot of these.

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- The inherent connection to death that the Mahjarrat have is actually based on Seren as much as it is in Zaros- specifically, the part of her that she rejected, making the Dark Lord. It's why Icthlarin was also able to reason with them all so well, being a god of death himself.

-Temekel  <- this guy supported the Mahjarrat leaving. He was the most powerful at the time; more powerful than Zamorak or Azzanadra, but there's no memory of him joining the Zarosian empire. He was likely dead before then. I'd like to think he may have taken the side of the desert pantheon, or died in Tumeken's blast.

- Enahkra worked actively to kill other female mahjarrat off and as a result ensured her own survival. And really,out of anybody that was at the last lore ritual, she was the one who was least likely to be sacrificed off, because if she dies, the race dies. 

- On that note, mahjarrat used to call mating the "ritual of enervation" due to calming Mah down during the earthquakes she created; it's been reversed and is now the ritual of rejuvination on Gielinor. It's not hard to imagine that it takes a lot of energy for a mahjarrat to have a kid and afterwards they'll be weakened immensely- it may well have been why Palkeera died. So, if a female mahj has kids, it's explosive, it's volatile, and other mahj KNOW. It puts them at a greater risk at a ritual due to weakness but also gives them immunity to a degree because they've proven willing to help ensure their race's survival.

- Muspah and their assorted nightmarish creatures are very, very much real- this has been shown during FotG. It's not a stretch to imagine that they've had a huge impact on their culture. Maybe Jhallan wasn't such a loser after all for having the nightmares.

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"On that note, mahjarrat used to call mating the "ritual of enervation" due to calming Mah down during the earthquakes she created; it's been reversed and is now the ritual of rejuvination on Gielinor. "

I think you may actually have gotten this bit mixed up. The Ritual of Rejuvination and Ritual of Enervation both existed on Freneskae. When Mah fell into a deep stupor and started dreaming up dangerous Muspah, they were taught to perform the Ritual of Rejuvination to sacrifice one of their own. The energy from the dead then went to Mah, rousing her and stopping the dreams that were causing Muspah to attack. On Gielinor, a death still releases energy, but it can't go to Mah, so the Mahjarrat absorb it instead. Conversely, when Mah woke up and started to rampage, it would cause earthquakes - they then performed the Ritual of Enervation, which created new Mahjarrat and drained energy from Mah, sedating her and stopping the earthquakes.

Related: I theorize that reproduction drastically weakens a female Mahjarrat (possibly both parents). Mahjarrat don't function by taking energy in from external sources, like the way humans eat food. They have to restore themselves by sacrificing one of their own kind and absorbing the Mah energy. When in the presence of Mah on Freneskae, they reproduced (cite: Enervation) by drawing energy from her. On Gielinor, they have no such energy source, but they still manage to reproduce (cite: Khazard) somehow. Where is the energy coming from? My guess is from the mother. 

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That would make sense. It would put an incredible amount of value on any and all females, as those alive are either survivors of childbirth or have yet to bear children.