In House Do'Urden's war against House DeVir, Dinin unwittingly saved his younger brother Drizzt's life by murdering his older brother Nalfein, thus making him, Drizzt, the Secondboy of House Do'Urden rather than the Thirdboy. Dinin was also a master of Melee-Magthere until the beginning of the Do'Urden-Hun'ett conflict. When House Do'Urden was destroyed by House Baenre he was spared by Jarlaxle under the conditions that he join the mercenary band Bregan D'aerthe. He was a trusted ally of Jarlaxle until he was turned into a drider by his sister Vierna Do'Urden, for openly mistrusting his older sister's motives.. In Vierna's personal raid for Drizzt Do'Urden, the transformed Dinin was killed in a vicious battle with King Bruenor Battlehammer.