Kalant End of an Era

Whatever Happened or happening or will happen on the earth it everything has a purpose. and whatever going to happen tomorrow it already founded its roots in past. End of Era is the one question that bothering everyone. According to Hindu mythology the Lord Vishnu will come to the earth in his last and 10th Avatara, Kalki Avatara. When the bad things will starts dominating Dharma the Lord vishu will come and kill the evils and destroy everything to save the Dharama and Humanity. But in Purana they said that distructiin is the job of Lord mahadeva, so where is his role and the Kalant is the imaginary story of that but their is lots of curse and blessings are still alive and no one knows it's purpose, like why Karna's kavach is still on the earth?, why Lord krishna's heart is still alive in jagannath puri temple?, why sapt chiranjivie's still alive?, why Balrama went to the way of patal after leaving his body ?, why the 7th door of Padmanad temple is the mystery?, Answers of many more things, i tried to justify in my this series kalant- End of an Era. And this is the 1st part of the series that will lead to the End.