Books I have read over and over, in my opinion books of gods: 

Pearl Saga by Eric Van Lustbader. Pure win if you can get your head around everything. A fantasy wrapped in a sci-fi sprinkled with mature elements that explore some very interesting concepts. Once I finally got my head around the content and into the world I could not put these books down. 

[hider=Pear Saga]The series centers on Kundala, a planet conquered by the V'ornn, a race of aristocratic, militaristic humanoids; themselves ruled by the Gyrgon, a cabal of mysterious androgynous technomages. The main character is Riane, a prophesied redeemer known as the Dar Sala-at, born at both ends of the cosmos. [/hider]

Dragonmaster Trilogy - Fantasy spliced with warfare. Solid good read, not so complex. 

[hider=Dragonmaster] 
Dragonmaster is an action trilogy following the life and exploits of Hal Kailas, a peasant who left home at an early age. During his early years Hal must work as a casual laborer. His dream is to fly dragons, so he joins a traveling troupe who give rides on dragons as entertainment from town to town. Hal is away from his home country and his king, Asir. When war breaks out, he is drafted into the army an as unwilling soldier. However, he does his best and works his way through the ranks of the army and society with his heroic exploits. Dragons are mainly wild and untamed creatures that are brought into the war, while Hal and others devise new and more damaging ways to use the dragons against their enemies. This tale is told in the first two books, which contain bloody action throughout. The third book covers life after the war, the difficulties ex-soldiers face, and how Hal deals with it.
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Dragonlance chronicles - Fantasy, classic, great books. Similar fantasy world to D&D. Timeless and definitely worth a read at some point. 

[hider= D Chron]
A group of old friends and new companions meet and begin their journeys to become the Heroes of the Lance. So much content and so many stories.... [/hider]