When I first created a D&D campaign back in 2004, after having only a session and a half of experience, one of the first things I did was sit down and create new deities for my campaign setting. The D&D books have their own deities like Pelor, Whosit, and Whatsisface, but none of them really called to me.
Oddly, I was familiar with the Dragonlance setting long before I started playing D&D, and their deities seemed way more interesting. Moreover, there was a theme of balance in that setting that attracted me. Rather than simply lift Paladine, Takhisis, and the rest straight from Weis and Hickman's pages, though, I created my own pantheon using the Dragonlance one as a loose template. The result was 18 deities, two for each alignment. I'm going to talk about the general mythology in this post.