Dream (radioactive parasite)

Had a dream where i was a low rank member of a team equipped to fight off a mysterious invasion of radioactive beings from who-knows. I somehow developed the ability to see the radiation they emitted (like a heat map) and the encounters were.like a tactical rpg (with a game over and retry). I lead the team to a fortress giving off loads of the radiation, but when we get inside, the radiation disappears from my vision. We go outside to find our exit path is in flames, and the other members of our team are irradiated and trying to stop us. The dream ends as I am trying to learn what the invaders' true motivations are by talking to the "infected."