Had a dream that I was playing a game where spiders invaded from space. They came from a giant mother ship spider and when they were all dead, you had to go back to their origin place, a giant space station with many different environments. On the space station the spiders could combine to form larger, more powerful spiders that combined their abilities. Eventually they could even make new motherships and the motherships could combine to make stronger ones. A bunch of people playing the game purposely allowed the motherships to combine to make more and more powerful ones for the challenge.