Death Night is an exclusive notification for the Har Ganeth faction of the Dark Elves race to inform the player the Death Night action has been performed and, as a result, the Death Night bar is full.
In-game description
In Har Ganeth, the Dark Elf desire for murder and blood is kept in abeyance by the strictest of laws in Naggaroth. Only on Death Night are these laws put on hold and the Druchii permitted to unleash their true instincts. Bloody excess and wanton slaughter flood the boulevards and plazas, all under Helebron's intense gaze - tonight is Death Night!
Hellebron will meet the dawn revitalised and strong from the night's bloody orgy, although over time she will wither once more. In the Death Night's aftermath her followers are sated, their murderous impulses gratified for now.