Board Thread:Warhammer 40k General Discussion/@comment-25507520-20150929194941/@comment-25618639-20151009023955

I believe that the Eldar's ability of reincarnation gave them a edge over other races. Instead of great leaders, scientists, and thinkers dying and never returning, they instead reincarnated and gave the Eldar race their knowledge and leadership skills "again", which allowed them to remain the dominant species in the Galaxy for millions of years.