Ive chatted a couple times ingame about a Undead faction and I reckon instead of food they should have corpses as a resource
probably make a spot where a certain enemy resapwns constantly but cant be lotted for gold but picked up by the mindless Ghouls (workers) and brought back which can then be used as a resource to resurrect into workers or soldiers.
Another way to collect corpses is to build a farm which spawns unarmed humans, world map camp view and PVP. All corpses have to be brought back to resource point.
As a magic/hero unit, the Necromancer could ressurect groups of freshly dead units as a source of cannon fodder with low damage but making the group of corpses ressed uncollectable