In-Game Information: Male, Night Elf, Rogue.
Background: Alive during the Burning Legion's initial invasion of Azeroth, Lelurinar witnessed their depravity and awesome power. Unable to comprehend and fearing the existence of such entities, Lelurinar felt a compulsion to end their existence so none of his people (the Night Elves) will ever have to experience an event like the bloodbath that occurred 10,000 years ago.
For centuries, Lelurinar increased his combat capabilities through traditional means, but he was making little progress towards possessing the power he needed to defeat the Legion's leaders, let alone their minions. Lelurinar needed a catalyst to increase his power if he ever hoped to match the Burning Legion's strength. If he sought to destroy the Burning Legion, he'd need to use the demonic essence of the Burning Legion itself.