I think that there should be monoliths and abandond spacetations(heavy damge to them). Useing the monoliths sends you into an empty void world with disturbing messages hidden in chests(this came in a dream BTW:
"The eldar are coming... the doom is coming... run, just run...*blaster fire**static*"
just as an example)
After you read it you get attacked(chased) until you can get to the exit(where you entered).
The space stations sumon a large miniboss for you to fight(medium size, 10k-20k blocks). Eventualy you can find a fortress that summons even bigger ships, these are defended with "alien" turrets. Finally you get coords(random drop from forts) to a boss summoner(titan, several hundred thousand blocks)... this can go on until it seems like it would become borring...
Finally you would get coords for the super boss summoner a super titan, several million blocks, mabey a cutscene when you win and when it spawns.
"The eldar are coming... the doom is coming... run, just run...*blaster fire**static*"
just as an example)
After you read it you get attacked(chased) until you can get to the exit(where you entered).
The space stations sumon a large miniboss for you to fight(medium size, 10k-20k blocks). Eventualy you can find a fortress that summons even bigger ships, these are defended with "alien" turrets. Finally you get coords(random drop from forts) to a boss summoner(titan, several hundred thousand blocks)... this can go on until it seems like it would become borring...
Finally you would get coords for the super boss summoner a super titan, several million blocks, mabey a cutscene when you win and when it spawns.