Sortie-like invasions

[Retrijeuj]

As the title implies, I'd love invasions to work like sorties, except on a much lower level. Instead of running three random missions with a bunch of Grineer/Corpus at the beginning, make it three successive missions with a random modifier, each one being a bit harder than the previous one.

Invasions right now aren't bad and I enjoy them. But they make little to no sense. Sorties don't make that much sense either, but at least you get the impression of following some kind of path.