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Add that the vessel got something that the sages of old never dreamt of: blood transfussions. The vessel may receive in their body blood from a prince, a beggar(people donate for money), a woman and a man. Young and Old. It has all the hallmarks of ancient magick and prophecy!
@PcMan my mistake, I was sleepy and confused Railgun with CoilGun. Those are far more lenient with dirt but sacrifice efficiency. But you forget the other part, the chain of production for Ammo. Railguns can launch any conductive element, even carbon/grapphite cores, nails, the list is endless. Any conductor is fair play as well as non ferrous material.
Also bear in mind that a Railgun can DIAL the power. Shoot with less power to avoid overpenetration or shoot with more power to bypass armor. It will be really handy and could simplify a lot of logistics for the army.
@Pelinore you hit the nail on the head. Yield per Area is a security concern in that scenario because you can not eat what was stolen nor work on it if you die.