Kin

Lexicanum:

Kin of the Leagues of Votann, often referred to as Squats due to their build, are known to be extremely hardy and resilient. This is thanks to their Cloneskeins, genetic templates that give the cloned Kin a variety of physical and spiritual abilities. Their species also have higher red and white blood cell counts, and formidable strength and resilience. Other Cloneskeins impart enhanced reaction times, infa-red vision, or limited resistance to extreme temperatures, gravity, and radiation. Many Cloneskeins manifest physically, whether it be unusually colored eyes or skin, craggy subdermal layers, chemical body odors, or various other giveaways.

More esoterically, Cloneskeins allowed the souls of the Kin to shine far more dimly in the Warp than other races such as Humans. This makes the Kin extremely resilient in the face of Mutations and temptations of Chaos. Thus there are no true Psykers within the Leagues of Votann. Even those Kin who carry psychoactive Cloneskeins shine just brightly enough to mesh with ward-tech, such as Ancestral Warding Staves and Crests which channel Barrier-Tech and allow for the use of limited Warp-based powers.

Ironkin are nearly or fully sapient robots treated by organic Kin as full equals in their society.