Dareth is the honorary brown ninja, and the supposedly, the master of hot air. I always thought that Dareth looked like he liked hot-air baloons. But I do not know why Dareth's element had to be HOT air. Some people say that that was supposed to leave a space for Morro's powers, but Dareth's powers were said in season 2, what was thought to be the last season. So the producers couldn't have thought of Morro's powers, and saved a space for him.