Can someone explain Dalamud and Project Meteor and Meteor spell?

[ManuelBravo]

Did they? I don't remember any of this being touched on in 2.0 or 3.0 MSQ. 2.0 MSQ seemed to be largely "Man, the Calamity sucked; we're still rebuilding. Man, these primals are killing the land; please go stop them. Man, the empire has a weapon that consumes primals; please go stop it."

Yep I played since v1 and also have an alternate. They show you scenes that explain it through both echo and normal dialog you start meeting the three nations and continue as you progress through main story.