1: The Tempest affected each world differently. Some were transformed into lifeless deserts. Here we see one of the Subspace Pylons that unleashed the Tempest.
2: Robots still roam the homeworlds. Some are the original surviving machines but others are second generation, built by robots.
3: Some worlds still have a breathable atmosphere. On these worlds recolonisation is hindered by other hazards such as extremes of temperature or violent storms and earthquakes.
4: Some worlds found themselves flooded, their treasures now submerged below oceans.
5: Power had gotten so efficient on some worlds that the supply is still running. These power plants are prime targets for salvaging fuel for Arks.
6: Some worlds find themselves cursed with an endless night and smoke-shrouded sky.