A saga of drugs, death, and abuse has ended with 77 years in prison for an online cult leader who sexually preyed on children. But federal authorities warn his “nihilistic” movement is far from over. Prosecutors won a 77-year sentence on Wednesday for 27-year-old Kyle Spitze on charges of producing child pornography, possessing and accessing the material, and abetting the distribution of animal crush videos. Spitze helped lead the online groups …