"A narthecium is a Space Marine specific medical device, like an advanced medical package. It allows us to diagnose and treat various ailments and wounds. However, as I am not a trained Apothecary, there are limits to what I can do. Many of the cures are specific to Marine biology as well. The painkillers I would have available to them would be too strong for most. They would kill a normal human, for example. They are paired with a Reductor, which is our final surgery tool. Space marines all carry two Gene-seed organs that are the basis of our legacy, one in our neck." He touches his own to demonstrate, "And one in our chest." He puts a hand on his chest. "When we are slain, our apothecaries harvest the matured gene-seed from us, for implantation into new aspirants, so we can have progeny, of a sort. The organs themselves are called Progenoids, for this reason."