Diablo might be best known as a series of action RPGs, but there's an entire universe of books and graphic novels out there that explore the dark fantasy world's expansive lore, and soon, fans will learn the origins of the popular Necromancer character class thanks to an all-new comic. Diablo: Legends of the Necromancer - Rathma arrives on October 23, but preorders are now available online.

Preorder Diablo: Legends of the Necromancer - Rathma

$20

Diablo: Legends of the Necromancer - Rathma tells the story of Rathma, the godlike Firstborn nephalem son of Lilith and Inarius who originated the Priests of Rathma--aka the Necromancers, which has been one of the most popular character choices since their introduction in Diablo 2. If that sounds like your thing, you can preorder Legends of the Necromancer: Rathma for $20 at Amazon and Walmart.

Preorder at Amazon

Preorder at Walmart

Diablo: Legends of the Necromancer - Rathma is the second entry in the Diablo: Legends graphic novel series. The series started with Legends of the Barbarian - Bul-Kathos, which follows the eponymous hero Bul-Kathos, the first barbarian. You can pick up the hardcover edition for just $13.49 at Amazon (was $20).

If you need more stories from the realm of Sanctuary, good news--There's plenty more Diablo reading material out there, a much of it is discounted at Amazon right now. There are comics like Diablo: Sword of Justice, novels like The Sin War series, and beefy art and lore books like The Art of Diablo--the second volume of which releases July 23 and is available for preorder. Check the list below for even more Diablo book deals.