The Elemental War

In the world of the dragons there are clans of dragons who hold different elements. The Fire Clan. The Earth Clan. The Water Clan. The Air Clan. The Ice Clan. The Electricity Clan. These clans used to live in harmony and help each other. But one day there was the king of the Fire clan the king wanted to rule all of the clans and rule the dragon world.
The prophecy dragons known as The Seekers, had foretold of a black and white dragon who will stop this war, and balance the world once more. This dragon is the symbol of Yin-Yang as it holds all the elements and two more. The knowing light and the mysterious dark.
Now the Fire King wishes to destroy all possible dragons who can dethrone him of his power however what will happen when he leaves one egg to survive in his own clan?