Someone explain to me, what is the motivation of the Knights King and the Others?
They don't need land, or gold, or the Iron Throne . What do they want? The children of the Forest are gone (revenge), do they just want to Destroy man and civilization... just because?
This may be the key to the whole series.
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Basically its what you just said. They want to destroy all life. Thats what they were created for and they are still trying to complete their mission.