Hey guys here's a little help in the final challenge when they finish out their units and send them to the fort when the giant beast out to put the shield but make sure that all units are attacking the fort so do not kill the beast
And I give you a little help in the final challenge in hard mode you need to have de Max shield (skill) and the 35 imps with the 18 mad bulls. When they get charged you need to make and assault but when you stay close of the boss use the skill and order the imps to attack the fortress and the other ones stay attacking the boss also you need to have max mana because when you stay attacking the fortress the boss will attack you so be carefull.