1-20

Bunker Complex: The pragmatist's fort, intimidating yet durable.

21-40

Airbase: Using ancient technologies, this armed stronghold floats above a planet's surface.

41-60

Impressive Citadel: Complete with gargoyles, high towers, and fluttering pennants (not to mention void shields and gun-turrets).

61-80

Space Station: Festooned with weapons batteries, turrets and heavily shielded.

81-100

Other: Up to the player, or reroll.