Thousands of years ago, they lived in fragile peace with humans, as King Mambo had an agreement with the First Spinjitzu Master that neither race could enter the territories of the other. When the First Age ended, they warred with each other for countless years until banding together during the First Serpentine War to fight against the humans. Led by the sons of the First Spinjitzu Master and the Elemental Masters, the people of Ninjago rose up and locked them away in five separate tombs