I like it, could have it as a fully autonomous titan that roams the map randomly attacking the factions, it would be impervious to all forms of attack so..........................how about the only way to stop it or hurt it would be something unusual like feed it deuterium or buy it gifts, construct a massive spacestation mirror to distract it with its own vanity, lure it into the path of your enemies with tasty treats or even destroy it by blasting it with a fleet of sound speaker ships playing Rick Roll'd YT vids.
Two words: Random Event. Specifically the "Mad Vasari Titan" event.
http://sinsofasolare...ad_Vasari_Titan