A small Craftworld that had been on the edge of the shockwave from the Fall, Altansar was long thought to have been lost in the Eye of Terror along with the homeworlds of the Eldar. However, there were reports of its sighting and even active involvement in the recently conducted campaign between the Imperium and the Chaos Marines in the Eye of Terror during the Thirteenth Black Crusade, and doubt now exists as to its fate. As of the 4th Edition Eldar Codex, it was revealed that Altansar did, in fact, escape from the Warp with the help of the Phoenix Lord Maugan Ra, and that Eldar of other Craftworlds regard its inhabitants with deep suspicion due to their multi-millennial imprisonment in the Eye of Terror.
Read more about this topic: Eldar Craftworlds (Warhammer 40,000)