izigame.me

I love games where you can play unorthodox characters like full-blown dragons *and* get unique events related to it. There's also lizardpeople. The content in this expansion is definitely what I've used the most so far, it's impeccable for a first DLC.
In terms of actual gameplay, the expansion adds 2 magic tomes of themed research, a new type of playable ruler that gains income bonuses by hoarding equipable items, and a new challenge map featuring a 3v3 war between unique and powerful dragon empires.
The first of the magic tomes is a particularly useful early-game option that focuses on cheap battle units that can evolve into a stronger form, and giving you the tools to aid in this along with other benefits.
The second magic tome is all about dragons, granting you the ability to recruit younger (but evolving) dragons in your own cities, along with additional options related to dragons and wyverns.
The Dragon Lords are still my favorite part of the expansion, and the customization really lets you go ham to make your own themed dragons to fit any type of faction, complete with signature skills that will visually transform the dragon to match one of the 6 affinities. You can even keep these upgrades when your dragon ascends to your pantheon thanks to post-release updates.
Aside from unique themed events that trigger exclusively for Dragon Lords, many existing interactions in the game are also given "primal checks" which are currently unique to dragons, letting you roll for success based on the dragon's level as a hero unit. It's fun to solve problems with free cities by scaring the issue away, like you'd expect if a dragon was actually present.