Dune
When does a faction become the Occupier of a homeworld?
Only after beating the native faction in a battle on its homeworld and having forces left there; or by being alone there. You stay the Occupier until you have no forces there, even if the owner brings forces back. A homeworld that is occupied does not count as a stronghold for the win. CHOAM loses its Low Threshold ability while its homeworld is occupied and regains it when the Occupier is fully removed.