This will be our last show for at least a month, but it's a great one! The two novels about the Phoenix Lords by Gav Thorpe have loads of exposition for the Eldar and the history of the 40k lore. You don't want to miss this episode. Note that there are super duper tons of spoilers in here.
Jain Zar: the Storm of Silence
http://www.blacklibrary.com/warhammer-40000/featured/the-storm-of-silence-ebook.html
Asurmen: Hand of Asuryen
http://www.blacklibrary.com/all-products/asurmen-hand-of-asuryan-ebook.html
Gav Thorpe
https://gavthorpe.co.uk/