Bloodthirster: Obsidian Armour, Firestorm Blade, Axe of Khorne

Herald of Khorne: Juggernaut, Armour of Khorne, BSB, Great Icon of Despair (w/ Bloodletters)

Herald of Tzneetch: Master of Sorcery (w/ Horrors, Lore of Life)

36 Bloodletters: FC, Icon of Endless War

19 Horrors: FC, Icon of Sorcery
20 Daemonettes: FC

3 Fiends

(3) 2 Flamers w/ Pyrocaster

4 Flamers

2500 on the button. The idea is for the fiends, BT, and Masque to push the flank, causing panic or just obliterating anything that doesn't flee, with the BT jumping at any opportunity to fly up on enemy characters and dispatch them early. The bloodletters with the Herald are obiously this army's big hitter, anvil them down the battlefield while the horrors and herald follow behind buffing them up for combat, flamers and nettes stride up their flank, protecting them from being surrounded and shooting whenever the opportunity arises.