From this point on represents creatures of a grade enough to be called vampires. Living corpses. The undead. Although they don’t have all the cognitive abilities of their previous life, they can feign a human life on their own.
Upper-class soldiers whose brains were reconfigured after having died once. They are fine under the sunlight, but a periodic antiseptic treatment is required in order to conceal their true identity. Falls in the category of those that are called “The Dead.”