Powers of X, increasing in scale and complexity. X0 - Year One, the Dream. X1 - Year Ten, The World. X2 - Year One Hundred, the War. X3 - Year One Thousand, the Ascension.
X0

Charles Xavier is walking through a funfair. He is enjoying himself on this beautiful day, sitting down on a bench to people-watch. Here, he is approached by a young woman, Moira MacTaggart, who makes cryptic remarks about a fortune-teller. As the conversation goes on, Xavier mentions a beautiful dream he had, which he is trying to work out in his head, so it can be a story he can tell people. Moira remarks that a dream ceases to be a dream once it becomes real.

Xavier realizes that something is not quite right about this, so Moira asks him to read her mind. Puzzled, he complies, but is surprised by what he finds...
X1

Mystique emerges from a No-Place portal onto Krakoa accompanied by Toad. Telling Toad that he is off the clock now, she carries on alone to the House of M, where she meets Magneto. She tells him that her partner Sabretooth was captured during the heist, but she got the target - a memory stick. She will hand it over, but says her demands have increased. Xavier steps into view, and counters that they will ask more of her in return. Mystique mocks his seeming lack of humanitarianism. Xavier merely says that he is building a world safe for mutants, and that everyone will owe something to live there...
X2

The war between the mutants and the Man-Machine Supremacy has gone on for years. A four-person squad of X-Men, consisting of three products of Mister Sinister's Mutant Breeding Program - Rasputin IV, Cardinal and Percival - and one defector from the Supremacy's Black Brain Program - Cylobel - are on a mission to extract something from the Nexus in the Northern Territory. Their mission has been discovered, leading to the death of Percival. Cardinal plants a Krakoa seed to be the exfil point, but Cylobel is captured alive and Rasputin struggles to free her. Additional forces arrive, and Cylobel demands that Rasputin leave her behind to complete the mission. Anguished, Rasputin runs.

There is a description of Mister Sinister's mutant breeding program where he ran the Mutant Breeding Pits on Mars. The mutant leaders would only countenance the program because constant fighting made it difficult for mutants to find the time to have children. The program lasted through four iterations:

The first generation were designed to be divergent copies of a singular DNA source with an uncompromised X-Gene. They were the fodder that were trained until the age of 16 where they would be sent to defend Krakoa which fell 30 years later.
The second generation marked the beginning of the "Chimera" process. They had DNA comprised of two separate X-Genes resulting in a mutant with the predictable power set of the sourced mutants.
The third generation produced mutants with amalgamated DNA featuring up to five X-Genes. These generations were universally successful against the Man-Machine Supremacy.
However, this generation had a 10% failure rate. These failures, with unthreatening powers and pacifist dispositions, rejected individuality and claimed the name "Cardinals"
The fourth generation suffered a systematic failure were produced with a corrupted hive mind that were responsible for the destruction of Krakoa and 40% of the mutant generation. They committed mass-suicide, collapsed Mars, the Mutant Breeding Pits, and themselves into a self-singularity.

It was also mentioned that Mister Sinister was executed by the Man-Machine Alliance after defecting.

---