I really hope I tag it right.
OK, so here is my idea for the third year in Brickonicle. Basically it is all about the Vahki attack.
So, on the island there is a evil servitor of Makuta, named Kulta. Kulta was created by Makuta after the Rahkshi lost the battle with the Toa in year 1. In year 2, Kulta kidnapped the best engineer from the island and force them to create the Vahki, a army of humanoid battle units that are even more powerful than a Muaka.
After the civil war, when the tribes were weak, he unleashed his army of Vahki in each region, conquering them.
Here are the Vahki types:
Ta-Vahli: Vahki of fire, able to walk in lava without taking damage.
2)Ga-Vahki: Vaki of water, being able to rezist at any water attack.
Le-Vahki: Vahki of wind, being able to fly.
4)Ko-Vahki: Vahki of ice, being able to survive at low temperatures.
5)Po-Vahki: Vahki of sand, being able to… do something.
6)Onu-Vahki: Vahki of Earth, being able to do… another thing
Every Vahki type have their own commander, who became the king of a region:
C&C are welcome!