What is skaven in 40k?

Skaven are not directly present in the Warhammer 40,000 universe. They belong to the fantasy setting of Warhammer, which is separate from the science fiction setting of Warhammer 40,000.

The Skaven are a race of ratmen who inhabit a vast underground empire known as the Under-Empire. They are cunning and treacherous creatures who seek to expand their territory and power at any cost. They believe that they are the true rulers of the world, and see all other races as inferior beings.

In the Warhammer Fantasy setting, Skaven armies are known for their high numbers of cheap and disposable troops, as well as their devastating war machines and deadly assassins. Their technology is highly advanced and often unpredictable, relying heavily on warpstone, a magical substance that can enhance their weapons and armor.

While the Skaven are not part of the Warhammer 40,000 universe, there are some thematic similarities between the two settings. Both feature a multitude of different races, each with its own distinct culture and technology. Both also emphasize the importance of strategy and tactics in warfare, with players needing to carefully plan their moves and outmaneuver their opponents.