I have a theory on who Madam X is. I think that Madam x could be Nymiera. I know it may be a long shot but hear me out. We know that Nymiera and Vitus were once married, that they were the couple described in the story about the war. Meaning that they would both know about the archetype. We also know that in our current time line the only people who knew about the archetype are descendents of Nymiera. We can also assume some of he stormchasers, and madam x knew as they have tried to recruit/kidnap Melia, possibly knowing she is a part of the archetype. So back to vitus, we know that he took over Anju's body and has now become angie. But what about Nymiera? If vitus has stayed alive that means that Nymiera still has a very strong probability of being alive in our current timeline. And the only person that fits the description is Madam X. Which is why I think that the goal of team Xen is not to create some sort of new world, but rather she is making an army to counter attack Angie/Vitus's forces.