Board Thread:Warhammer 40k General Discussion/@comment-69.143.134.163-20150419161351/@comment-177.128.41.5-20151228002848

I think one of them allied with the Eldar and the other one used banned dark age technology (AI). The Eldar sympathizer was purged and the Tech heretic found his end with one of his creations (Men of Iron), and thus forgotten.