From the post:
In DragonFlame you will take turns placing 3 cards on to the Castle cards in the center of the table. This will create piles of cards that you will get to choose from at the end of the round. The pile you choose will also determine your turn order for the next round.
Once you've taken a pile you place the cards in front of you for end game scoring. Any DragonFlame cards you have acquired give you the ability to flame villages (area-control) making it harder for your opponents to earn glory points.