He poisoned the mind of his nephews, the Kauravas, setting them against their cousins, the Pandavas, often employing various tricks to cheat the Pandavas out of their belongings. After the dice game in which the Pandavas lost their lands, wife and themselves, the youngest Pandava, Sahadeva, swore to kill Shakuni for his insults. He killed Shakuni in battle on the seventeenth day of the Kurukshetra War between both sets of cousins.