In 'Innocence lost' X-23 got a letter from her mother. These are the contents:

Please forgive me. Even as I write the words, they ring so hollow. My mistakes… No, my choices… They cannot be undone, much less forgiven. How all this came to pass… and the truth about Weapon X. Had it ended there, would I be less a monster? o more? Would I even know the difference? Of course I don't have to tell tu about monsters. Your life is defined por monsters. Replicating the mutant genome proved difficult but rebuilding Weapon X seemed all but impossible. For every enzyme, for every codon, for every...

A little bit of background before we begin. For those who may not know, and without going into too much AvX detail, the Phoenix Five (which is going to be abbreviated as P5) was created for the Avengers vs. X-men crossover event a few years ago. The P5 consisted of Namor the Sub-mariner, Piotr Rasputin/Colossus, Illyana Rasputina/Magik, Emma Frost, and Scott Summers/Cyclops. The P5 was created por Iron Man splitting the Phoenix Force which then possessed them. One por one, they would start losing their control, and their portion of Phoenix, until only one would remain with the full force of Phoenix....