Devas were taking incarnations on earth to reduce adharma which had increased beyond limits. They would assist Lord Krishna in this. It was Somadeva's son called Varchas who incarnated as Abhimanyu. When Varchas was about to go to earth, Somadeva told the other Devas- I can not live without my son for long. He will live a short life on earth, eliminate a large number of evil kings, and return to me at the age of 16. Abhimanyu was 16 when he was killed in the battle of Kurukshetra.
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