The Incomplete Promise

As the last promise to Karna, Lord Krishna gave him a boon that he was going to be born in Kaliyug with his wife and his brother Duryodhan and his wife to help him control the kali in Kaliyug before he was born as Kalki.
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In the 21st century, Harry Potter and his aunt's family got a free trip to India before his third year when they visited The Kedarnath Temple, which Pandavas built after they killed so many of their cousins, including their elder brother. When Harry stepped into the temple, he felt nostalgic, as if he knew something more than anyone who knew history. Then he met this sage who looked at him in shock. He just kept his hand on Harry's head. Next thing he knew, he remembered all his past and the promise he had given to Lord Sri Krishna. Now, he has two missions: he has to stop Voldemort and stop Kali until Lord Kalki is born.

HarryPotter X OC
Hermione X Draco