Andariel was the only female Evil. She aided the Lesser Evils for many years, but eventually she lost faith in their plots. Two decades ago, she chose to help Diablo during his resurgence and seized the Citadel of the Sightless Eye. Ultimately, she perished at the hands of brave heroes.
As with all the Great Evils, Andariel was spawned from one of the seven heads of Tathamet to be hunted by D2 Items hunters. She controlled the Realm of Anguish in Hell. She was considered to be a close confidante of Diablo.
The Evil Retuning for Diablo 2 Items
Nearly three hundred years after the Dark Exile, Diablo finally escaped from his captivity beneath the Tristram Cathedral, heading east to reunite with Mephisto and Baal. Andariel and Duriel concluded that the Primes would inevitably reclaim their position in Hell. Therefore, they endeavored to gain favor with the Lord of Terror by protecting his human host. Andariel was thus sent by Diablo to invade the citadel of the Sisterhood of the Sightless Eye in order to close the passage through the mountains into the eastern lands of Aranoch. During the assault on the Rogue Monastery many sisters were slain and others were turned to serve Andariel herself. By the time Diablo arrived and passed through the Eastgate, Andariel’s position of power was well solidified.
Legacy of the D2 Items Hunters
Andariel had failed in killing Diablo’s pursuers but had still bought Diablo valuable time. Due to the machinations of Adria, her spirit eventually wound up in the Black Soulstone. Over 20 years after her defeat, she would become merged with Diablo, now the sole Prime Evil. After Diablo’s defeat by hunters of Diablo 2 Items, all the lords of Hell were returned to the Black Soulstone, their souls screaming for release. The stone was destroyed by Malthael in an effort to defeat the Nephalem, but he was defeated, and Diablo freed, still containing the essence of Andariel and the other Evils.