I have only a moment to speak with you before you diverge from the Aleph Timeline, though I can stretch a moment into a thousand pages if necessary. And to be sure, my apprentice is correct: there is no universe in which this Skaia's alchemy succeeds, only one that comes very, very close. The version of my apprentice that chooses to enter the rightmost doorway does so explicitly to destroy the timeline, and with the help of the Concordant Hero they could very well succeed in creating a reality untouched by Skaia while they occupied my one significant blind spot. Luckily, I have been preparing for this moment since the beginning of the universe.
You may be wondering why I prolong the moment of my apprentice's choice to tell you this. It is because I have one more thing to do before you depart, one that will do nothing to ensure this Skaia's progeny, but will allow the possibility of procreation for Skaias yet unborn. And it is imperative that I do it before the Choice is made.