Clash of Clans dragons overview. To unlock the dragon, you need a Level 7 town hall and a Level 9 barracks. Dragons will cost you 25,000 elixirs to train, but they are worth the steep cost. Dragons are very strong, which allows them to inflict a lot of damage. The best way to utilize this troop is to take out any air defenses that can easily take out your dragon. Next, deploy your dragons next to any of the opponents buildings and watch their power destroy everything in sight. For more tips and tricks on clash of clans, check out more videos here at GamerU. http://en.wikipedia.org/wiki/Clash_of_Clans Go to www.GamerU.com to view our entire library of fast, fun and free tips. We are adding new courses and uploading new videos at www.GamerU.com every day. Not the education your parents had in mind.