Reading Challenge- Downfall

This is an exciting book. It is about robotic warriors, transformed by a mysterious mask so they can breath underwater. They have to make peace with an underwater city and a mad jailer, while fighting various mutated sea monsters, while searching for the mask that transformed them in the first place. Unknown to them, 6 warlords from a long time past have come to the place to get the mask, for they think it will help get back their empires after being banished. Also, an ancient enemy comes to the underwater realm to make sure that his plan succeeds. This is a very interesting book but sometimes the story is hard to follow, but overall, it is a good book.