How about enemy hub?
Hub Located: random infected sector
Allowed to visit:
All factions
History:
Ancient organisms that began to infect all around. He seeks to gain control over the entire galaxy, and / or destroy it. For years, he grew and created offspring that zaradalo neighboring sectors.
The infected Overmind, organic structure that control all infected. Crew that found them can teleport inside, and left the pilot in the ship, his mission dodge spores. Other crew members hsve s mission to find and destroy а brain. If its done all infected in their sectors become immobile and do not attack players.