ProxyStudiosRok

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We had so much to draw from for the base factions already so we didn't want to go there to begin with. I can see us explore that with expansions, but I don't have concrete answers right now. It could be done either way. We have to ask ourselves though, wouldn't we prefer an entirely new race rather than a little supplement, given how interesting they are? As a point of focus, we're currently prioritising entirely distinct factions for expansions, but we're not excluding adding special new units.

I would like to point out one thing, that is often disregarded by 40 K fans and deserves more mention. That is the crazy terrifying wildlife in the Warhammer universe. The sheer threat of it all and the focus on survival. From Psychneuein hatching larva out of vulnerable brains to Catachan Devils crushing you with their tails. We tried to do all of that justice. Gladius is not a piece of cake to walk around. And some of the -exclusive units that could be added to a playable faction or are of an entirely undone faction are sometimes found exploring the world or completing quests.

This is literally the Ork story quest name: "Chapter 5: Red Wunz Go Fasta".

They're extremely asymmetrical. Broadly speaking they all differ in how they handle the economy and which special powers are at their disposal. There are more concrete examples in the other answers.

Before living memory, there was The War in Heaven, fought between the long-lived Old Ones and the jealous Necrontyr. In their mutual desperation to survive, the Necrontyr sacrificed their organic bodies to the Star Gods called the C’tan, thus becoming the mechanical Necrons, while the Old Ones created the species of the galaxy as we know it. They also left scattered relics of great value -- precious few of which still survive ...