The Industrial Combine is the largest of the four empires and the one a human eye recognizes first. Rivets, plate, foundries, and a ledger. Mines and yards across hundreds of systems. Their own line on it fits on a stencil: production is civilization. Everything else is overhead.
Combine ships are built to last and built to be replaced, both at once. Heavy plate, strong shields, guns made for a long bombardment, stamped out the same way a thousand times. Elegance is not a line item. Function is the whole form.
Their captains came up as directors, foremen, auditors, and liquidators. A fight is a calculation. They take it when it pays and leave it when it does not. That makes them predictable. Predictable can be used, if you do your own math first.