In a nutshell, you need the technology for it and 6 prints that can be found from. You have to get there through the l gates initially. A fleet invading everyone, an empire.
You get to choose the specific cluster out of 5(?) options, and how it connects to the. According to the wiki, one of four things should happen: Originally part of the regular.
I moved my fleet to try and take out the ships in a neighbouring system and another tempest fleet moved into the terminal egress, taking out my starport and science/consruction ships there.