The Supreme Imperium does not acknowledge any power other than its own and faithfully follows the orders of its supreme leader, the Golden Prime Emperor of All Heavens. They conquer entire worlds, turn inferior civilizations into docile subjects and collect their ressources to fuel their Fleet. All shall submit or die for their glory.
"Your planet owes 36 billion credits to the Empire — including the new tax on poverty."
Tax Collectors travel across all corners of the Empire to reap what each system must pay. Taxes increase each year, as the Empire expands and needs more resources, but this is the price to pay to deserve the protection of the Fleet. Otherwise, systems are left without any defense, or wiped by the glorious Destroyers.
"How is this oxygen overpriced ? If you don't want to buy it, you can just suffocate to death."
Trade Vessels have the monopoly on all commerce within the Empire. No transaction can happen without their approval. As such, they're the ones setting prices, always to the advantage of the Imperial Treasury. They're also in charge of crushing black markets and dispensing divine retribution against those involved.
"If it can stand up, it can fight. To the army it goes."
The Callers are responsible for enlisting warriors into the Imperial army. They land on occupied planets and requisition every person able to fight and die for the glory of the Emperor. Their job is never finished because the mortality rate of fighters is extremely high: a testament to their faith to the imperial cause.
"Greetings, criminals. We have a large discount on missiles today."