The first 3 parts are now rare. You can replay the finale at: Rip in the Sky -> First Left Door -> Click Secret Entrance above the Water pool -> Right Scroll on the table. (left scroll is Carnax). Basically:
spoiler:
We kill Akiloth and that puts the elemental realms in a state of imbalance. We are told to then raise an egg that will become the balancer between the elemental realms. That egg at the end grew up to become Malkroth as we see in Storm of the Century.