Old Ones (Warhammer 40,000) - Slann

In the fictional universe of Warhammer 40,000, the Slann were a reptilian or amphibian species who were servants of the Old Ones (although some sources state that they in fact are the Old Ones) not unlike the Lizardmen of Warhammer Fantasy. The Slann are reputed to have created some of the major races in the Warhammer 40,000 universe, the most notable of which are the Orks (who are hinted to be referring to them as the Brainboyz, though the most recent publication of the Ork codex has implied that the snotling fulfilled this role) and Eldar (who are the only race that keeps records from the age) who were created with their psychic abilities to take part in the war between the Necrons and the Old Ones in which they were all but wiped out by the C'tan and the Enslaver plague. The Human race was a race for which basic evolution was allowed to continue without the guidance of the Old Ones.

There were five generations of Slann spawned by the Old Ones. The Slann of the first generation have all died off, many likely killed in the war between the Old Ones and the Necrontyr. This is very similar to the story of the Slann race in Warhammer Fantasy, if not the same storyline.

Slann ruins and relics occasionally feature in novels or short stories set in the Warhammer 40,000 universe.