The Storms of Impurity

As soon as impurity is born, the new brother shall bring forth the destruction of culture and the downfall of an empire.
Once snow and thunder collide, a challenge shall bring an era of sorrow.
Once the horned one returns, a duel shall cause the rise of hope.
It shall be then, when mountains move and rivers shiver, a refusal shall cause an end to hunger and an age of abundance.

Cormack and Stormy have been best friends by chance for the longest times, fraternal twins, in fact, so they have to deal with each other. When these two were born as part of their country's culture, were given a prophecy they were to share for the entirety of their lives. Soon after their tale was sent in to be recorded, they were taken away as a security threat, and never met their parents.