After Ghalphalshi (the Balach city) was destroyed, a lot of mugwumps migrated to either Hallifax or Magnagora, MAINLY to Magnagora, because it was geographically the closest thing that wasn't Celest.
I actually thought that the ME1 combat was a lot more hilarious than the ME2 and ME3 combat, because of the biotic powers and how you could literally throw everything everywhere and make enemies fall 1000 feet out of the sky to their deaths.