this idea of mine will allow you to combine your units to make new ones. you could take a giant and a barbarian to make a giant barbarian. then u could take a wallbreaker and an archer to an archer that has exploding arrows that do splash damage in its three tile radius. maybe u want to put in a wizard and dragon to get a dragon rider which has two attacks. also if u want to pu in more than two units u could to get a special unit each combination of units could turn out different. I also forgot to mention that there is a small fee the more units the higher the fee gets.



