It all began eons ago, when the gods of Shadow Inhabitited our world.
They shunned the creation of new life, for that was the work of the gods of light, but one of our god broke that ancient comandment, and brought life into the Gods Domain.
The shadow Gods were quick to take vengence, as they tore apart the one who had broken thier rules, but his creations stayed. Unable to kill the always reproducing beasts on thier own, from thier own essence they rose the first death knights, Infusing the essence in beings of metal, letting thier power flow unchecked within thier creations.
The first death knights purged the Gods Domain of Life, and hence forth they have toiled in the art of death, killing all life who cross thier path.
We now exist for the same purpose, stil ldespising the cruel welding of Flesh and bone, but we make exeptions for nations willing to air our conquest.
We are a strange creation, a welding of metal and shadow, we begin life as what we call the mindless ones, automatons who are not yet worthy of the blessed shadow, If a mindless one proves himself in combat, he will be rewarded with the kiss of the gods, the shadow will spill into his machinery, making him whole. As a Necrolic matures, his shadow essence begins to eat away his metalic shell, he will start wearing the robes of his forefathers, untill he is only shadow, a mask, and his Relic. From there he will chose his path in life, serve as a conduit for the gods, or take up the blade and rifle once again. Those who choose the path of the gods will be rewarded in due time, with our final acension, a form of pure shadow, a form of perfection, crafted in the likeness of our gods. These are our elite, rarely ever seen in battle, these creatures are death incarnate, sparing no mortal who cross them.
(I'm almost done with our history I just need to add some things, about our culture and ways, and up load the artwork)