I like Traviathan's Idea ... and now for something completely different!
Mad Baker unit, available through an event in a city that has an alchemy lab and a bakery.
mad baker unit has 6 attack, 4 defense, cannibalize, 20% withdrawal, and gives units the "food" promo through combat. If someone is wounded by anyway, or withdraws from combat from the mad baker (or if the mad baker withdraws) the unit gains the food promo. food promo does NOTHING for the unit, except maybe subtract a strength point like the weak promo. Instead, it does something for the killer. It heals 50% health of the killer's unit upon death, and gives 5 food to the storage of the nearest city of the killer. essentially the unit is eaten. which would mean, not only does the mad baker get cannibalize, but if it takes more than one hit to kill its victim, it kills a victim with a food promotion, which heals the baker a further 50%, and adds 5 storage food to the nearest city.
The unit that kills the mad baker converts him to their cause ... therefore the baker can never truly die!!! only serve the master which has the greatest desire for breadly goodness! muahahahahahahahahahahahahahaahahahahaaaaaaa