Someone wants to make a necromancer but we didnt want to have all the work of keeping track of all the generic undead from create undead etc spells. so i was thinking of somehow making an alternative class feature to give an undead but treat it sort of like a druid's animal companion or something becuase i dont see that really being more powerful than having an army of undead made by someone with all the corpsecrafter feats since they would only be allowed the one?