In the Mass Effect games, the Citadel effectively serves as the player's hub world, a place they return to either find new quests or continue existing ones. Es wurde vermutet, dass die Citadel von den Protheanern erbaut wurde oder schon davor existiert hat. For Mass Effect on the Xbox 360, a GameFAQs message board topic titled 'When is 'the point of no return'? 1 - Arrival To begin, look over the map above. The Mass Relay network and the Citadel were built so that Mass Effect's … Just as the Turians are military specialists, Salarians … And yeah I think the Serpent Nebula with the Citadel is a bit further to the left-bottom in Mass Effect 2.
