I'm suggesting a dragon tower with a fire breathing dragon at the top. It will protect it's surrounding area or can be set to protect only the TH. To attack (take down the tower), defending troops can ascend the stairs, use bombs, spells, or heros. However, the higher the lvl of the dragon, the more intense his flames and attacks become. Also the reach of the flames are extended with each lvl up. I recommend unlocking the tower at th8. The tower should require elixir to build and upgrade but, the dragon will cost dark elixir to unlock and upgrade. The tower dragon should be bigger than the troop dragons with more exaggerated features (glowing fire aura maybe).
