Tiamat!

These links are more for my own use. If I start GMing a fantasy campaign next week I might make Tiamat one of the big bads. However, you should totally use these links for great adventure fodder!

Zak Smith wrote up some awesome notes for the the Five Churches of Tiamat

Then Daniel Davis has written a bunch of great ways of making Hoard of the Dragon Queen interesting and fun

And finally, Courtney Campbell has been remixing and rewriting the chapters of the adventure to make it darker, deadlier, and delightfully fun to read!

Also, here's a review that eviscerates the adventure as written.