One thing I absolutely love about Evolve is that there is no actual explanation to where the Monsters came from, leaving it to the imagination of the players. What are the theories that you’ve made up to explain the origin of the Monsters?
Mine is that they’re the ultimate plague. They’ve become so effective at spreading, consuming, and adapting that they’ve evolved to the point where they can successfully travel between dimensions and continue their rampage after the last universe has been consumed. They move from universe to universe, and after they’ve consumed every last lifeform in the respective universe they move on. And we’re next.
It’s likely the universe they came from is not their universe of origin, but was rather the last universe to fall victim to their slaughter.