I finished up the Enter the Ninja event in DomiNations. The final reward is a Ninja Dojo which allows you to build Ninjas and Shinobi, ninjas are basically weaker versions of Shinobi which are also cheaper about half as much. Shinobi cost 1100 gold and primarily go after defensive structures. In the video I build an army just consisting of these guys to see what would happen. As you can see they destroyed every defensive structure in the base but after that they are kind of useless. These guys will make a great augmentation to an attacking Army. The Ninja Dojo is temporary so enjoy it while you can.