I play with a friend. We're pretty much friendly with most factions but 2 new ships showed up as we were out mining an asteroid in a friendly? sector and blasted us both back to the stone age. I checked the faction list as well as going into the command prompt and typing faction list. The 2 ships weren't listed! One was [ARC]Levathan and the other was [Tesari]Eternal Glaze. Some other ships from Polaris came in and helped us fight but being in a tiny ship, and mining an asteroid, we died instantly. I tried using the change reputation points command but it said no such faction. What's going on?
If you want some lore about the Tresari (which the Eternal Glaze is a part of) you can go to the faction call thread where I made a post about them (3rd page). I'm not saying it's cannon information by any means, but in my mind unless Eleon want to make changes then my post gives some of their lore/history.
Some prometheum asteroids are 'protected' by drones. I'm not sure wether they will attack you if you mine these asteroids and have a neutral or friendly faction rep with them, but to avoid rep loss go to another asteroid without these drones patrolling.