Serpentine

The Serpentine, also called the snakes, are an ancient race of reptilian humanoids who were once the dominant species of Ninjago in the times of the First Spinjitzu Master.

History
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, one for each tribe (Anacondrai, Hypnobrai, Fangpyre, Constrictai, and Venomari). 40 years after the war, they were released by Lloyd Garmadon and Pythor, the latter of whom united the five tribes in a bid to conquer and destroy Ninjago. After claiming the Fangblades, Pythor unleashed the fabled Great Devourer from the Lost City of Ouroboros. The colossal serpent consumed Pythor and Master Wu and wreaked havoc on Ninjago City before being killed by Lord Garmadon.