An extremely isolated Craftworld of the Eldar. Under unclear circumstances, at some point in the distant past Kaelor made a webway jump to the edge of the galaxy and has not ventured back towards the galactic centre for several millennia. It has virtually no contact with the outside galaxy, and even the Harlequins barely remember its existence.
Read more about this topic: Eldar Craftworlds (Warhammer 40,000)