Combat begins outside on the rocky planetary terrain. The Bain, now aware of your presence, arrive in large dropships. These dropships signify one of the key innovations of Tabula Rasa: there is a technical means by which enemy AI is respawned. You might encounter random baddies in your explorations, but most of the time they will work in squads close to key facilities. If you clear out a stronghold, baddies will not randomly respawn. Unless a dropship or waypoint is located nearby, once you clear out a location the Bain will not return (unlike other MMOs).