The Great Vy'keen Sentinel War was a battle of the Vy'keens against the Sentinels, and was mentioned in the Saga of the Vy'keen. It started when Nal the Vy'keen was slain by Hirk, and when Hirk dropped opressing Sentinels down the pit. No - one knows how long it lasted, and the Vy'keens got weaker, until Hirk was scared off by the Sentinels and fled. Hirk's body was ravaged by old age so he tore himself into two in front of the Great Monolith and he was killed. This event ended The Great Vy'keen Sentinel War.