It can increase usage of army abilities or help upgrade settlements. Food: Food is a special resource that Skaven must manage alongside money.Additionally, Skaven can establish secret Under-Cities beneath enemy settlements. Skaven Under-Empire: Skaven settlements appear as ruins to other factions, until discovered.No cavalry or flying units, though some monsters might fill this role. Units: Masses of cheap expendable units, backed up by horrifying monsters, and devastating war machines.8.5 How to play the Skaven Lords & Heroes.3.2 Strength in Numbers and Scurry Away!.