Board Thread:Questions and Answers/@comment-26285368-20150406210835/@comment-4651179-20150406211901

So, in Uncanny X-Men #23, he Last Will and Testament of Charles Xavier was read.

In it, it was revealed the existence of a super duper powerful mutant called Matthew Malloy. Cyclops tried to control him but failed and ended up getting himself and Magik and Emma Frost killed in the end.

Because of that, Eva Bell used her time-travelling powers to go to the past, where she explained the situation to past Professor X. In the end, past Professor X went to the university Matthew Malloy's parents would've met and ensured they didn't, thus Matthew Malloy never came to pass.

Because of this, two timelines were created because of Tempus' actions. The one in which Matthew Malloy exists and Cyclops, Magik and Emma Frost are dead, and the other one in which Matthew Malloy never existed, and everyone is alive.

The timeline where everything is good is the regular Earth-616, and the one where everything went horrible is this Earth-TRN533 you're talking about.