I really enjoyed the first 4 books of that series; it's more fantasy/sci-fi than it is horror. The last 3 books were odd for me, though. I liked them, but some of the story was very disjoined and just...weird. That's really the only way I can describe it without spoilers.
Have you read The Forever War, by Joe Haldeman?Old Man's War by John Scalzi - The whole setup of the story took a while, but am enjoying the last third of it.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.