The Serpentine are an ancient race of cold-blooded reptilian humanoid snakes who were once the dominant species of Ninjago, until the people of Ninjago rose up and locked them away in five separate tombs, one for each tribe (Hypnobrai, Fangpyre, Constrictai, Venomari, and Anacondrai) to ensure they don’t unite to exact their revenge on those who imprisoned them.
40 years after the Serpentine War, you discovered a map revealing the location for each tomb…
(Each Serpentine tribe has a unique ability: Hypnobrai can hypnotize others into loyal servants or sleeper agents, Fangpyre can make anything they bite turn into a snake (human or not), Constrictai have powerful grips, Venomari can spit hallucinatory venom, and the Anacondrai are capable of turning invisible.)