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ringleader - Someone who is the main influence or motivator behind a particular action or event, especially a disruptive or controversial one.
The police managed to arrest the ringleader of the gang, who had coordinated the series of robberies across the city.
nirvana - (in Buddhism) a transcendent state in which there is neither suffering, desire, nor sense of self, and the subject is released from the effects of karma and the cycle of death and rebirth; it represents the final goal of Buddhism
As the Buddha meditated under the banyan tree, a serene glow seemed to appear around him when he finally achieved nirvana.