Quizzically Yours

Bhishma was once looking for wives for the Princes of the Kuru race. He went to the Kingdom of X, whose princess was supposed to be the greatest beauty of the land of Bharata. During the swayamvar however, the princess of X refused to marry the Kuru Prince. Bhishma then attacked the kingdom of X, defeated the King and imprisoned the entire population, giving them one handful of rice to eat a day.The King decreed that the handful of Rice be given to his youngest son, so that the family lineage be continued. One by one, the entire population starved to death, as was expected. As he lay dying, the King called his youngest son and asked him to swear revenge on the entire Kuru Race and be the cause of it's downfall.He then asked him to salvage the bones of his right hand and perform a certain act that was to aid him in his Quest for vengence.

Who? What act? Put full fundaes...

cupidcobra1 gets it right.
Its shakuni who made a dice with his fathers bones.