I think their name says it all - they "combine" their civilization with others through oppression and/or extermination.
Or you can interpret it another way. A "combine" is a machine that harvests crops. So they "harvest" other worlds for whatever raw materials, etc. they need and then leave a dead, desolate world in their wake.
What do you think?
Or you can interpret it another way. A "combine" is a machine that harvests crops. So they "harvest" other worlds for whatever raw materials, etc. they need and then leave a dead, desolate world in their wake.
What do you think?