There are a number of special buildings in certain territories, one of the closest being Mahrak, several called Nehekharan Excavation, which provide Ushabti recruitment and unit capacity. These remain somewhat limited but exist in several places. I'm sure there may be other special buildings throughout Tomb King major territories that could give perks like this. (In my game I've yet to go to war with Setra, who owns most of them now, so I've not seen them all.)

引用自 Quimut：

There are a number of special buildings in certain territories, one of the closest being Mahrak, several called Nehekharan Excavation, which provide Ushabti recruitment and unit capacity. These remain somewhat limited but exist in several places. I'm sure there may be other special buildings throughout Tomb King major territories that could give perks like this. (In my game I've yet to go to war with Setra, who owns most of them now, so I've not seen them all.)

Yeah I noticed that when I played more of the campaign, had to restart it though because I made the big brain move to fight skarbrand at turn 18