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In the Mahapurana, the Uttara Purana, after twenty Kalpas have passed in a thousand years, the last Kalpa, Jalamanthan, will be extremely sinful. He will be the last king, meaning there will be no king after him. At that time, the last Muni will be Viraangaj, a disciple of Chandracharya. The last Aryika will be Sarvashri, the last Shravak will be Agnil, and the last Shravika with excellent vows will be Falguseena.
All of them will reside in Ayodhya and will be the last righteous souls of the Dushama Kalpa. When eight months remain in the last Kalpa, on the last day of the dark fortnight of Kartik month, in the morning, when the Swaati Nakshatra rises, Viraangaj Muni, Agnil Shravak, Sarvashri Aryika, and Falguseena Shravika will all leave their bodies and lifespan, and due to the influence of righteous conduct, they will go to the first heaven.
At midday, the king will perish, and in the evening, the fire will be extinguished. At that time, the Dharma that is the root cause of the six karmas, family, country, and wealth, will be completely destroyed. All of them will meet their destruction together when their respective causes are fulfilled.
After that, the Ati-Dushama Kalpa will arrive. At its beginning, humans will have a lifespan of twenty years, be three and a half hands tall, constantly eat, be sinful, and come from and go to either hell or the animal realm. Due to the lack of cotton and clothes, for some years, they will wear leaves and other things, but at the end of the sixth Kalpa, they will all become naked and, like monkeys, will be miserable and eat fruits and other things.
Due to the fault of time, the clouds will rain very little for twenty-one thousand years. This is only right, because time cannot be violated. The intelligence, strength, body, and lifespan of humans will gradually decline. At the end of this Kalpa, humans will have a lifespan of sixteen years and be one hand tall.
At that time, only the unstable and inauspicious qualities of karma will bear fruit. The people of that time will be black, their bodies will be rough, they will be unfortunate, have bad voices, be wicked, difficult to look at, have ugly forms, be weak, have sparse teeth, their chests, cheeks, and eyes will be sunken, and their noses will be flat. They will abandon all good conduct and be tormented by hunger, thirst, etc.