History:
Lolth was banished to the Abyss by Corellon Larethian, who has forevermore been her enemy.
Forgotten Realms
Long before the elves first travelled to Abeir-Toril from the original elven homeland of Tintageer on the magical world of Faerie, Lolth was known as Araushnee, the "Weaver of Destiny", a Lesser deity of the Seldarine, the elven pantheon of gods. As a goddess of weavers and a spinner of fate, the destiny of the Ssri-Tel'Quessir (dark elves) was placed in the hands of Araushnee by the decree of Corellon Larethian, Creator of the Elves and leader of the Seldarine, in addition to being the consort of Araushnee. The union between Corellon Larethian and the Weaver of Destiny in the form of two children, the Lesser deities Vhaeraun, the Masked Lord, and Eilistraee, the Dark Maiden.
Despite all of this, Araushnee was a jealous schemer who envied Corellon and secretly planned to overthrow him and replace him as First of the Seldarine and Coronal of Arvandor. Allying herself with Gruumsh, leader of the orcish pantheon and an arch-nemesis to Corellon, Araushnee attempted to have her consort assassinated by using her position as a loved one of Corellon. Her many attempts to kill the First of the Seldarine failed and eventually these plots were discovered by Sehanine Moonbow, the most powerful goddess of the Seldarine, who had also been suspicious of Araushnee's true motivations. Upon confronting the Weaver of Destiny, Sehanine Moonbow was imprisoned by the traitor goddess. Seeing an opportunity, Araushnee was roused to action and she, Gruumsh and her son Vhaeraun, another co-conspirator in Araushnee's plots, gathered together a great alliance of Greater and Lesser deities of the orcs, goblinoids, kobolds, giants, ogres and many other gods of the evil races. This army of deities was also joined by Malar, god of evil werebeasts, Auril, the savage Frostmaiden and Ghaunadaur, or That Which Lurks, a primordial evil and a future member of the Dark Seldarine.
The god-army marched on Arvandor, facing Corellon Larethian and the rest of the Seldarine (bar Sehanine Moonbow, who was still imprisoned), including Eilistraee, who was unaware of her mother's treachery. During the battle that followed, Araushnee and Vhaeraun feigned to fight for the Seldarine while attempting to aid the opposing army, Araushnee even going so far as to redirect an arrow fired by her daughter to hit Corellon. Amid the course of the battle, Sehanine Moonbow managed to escape her imprisonment and revealed the treachery and betrayal of Araushnee to Corellon. The battle for Arvandor was eventually won, the evil army of beast gods eventually driven off by the combined might of the assembled Seldarine and the other fey deities of Arborea. As the battle was being fought, Corellon Larethian faced his betrayer.
Araushnee once again tried to kill her former lover but the intervention of three elven goddesses prevented this. Sehanine Moonbow, Hanali Celanil and Aerdrie Faenya had all come to battle Araushnee the Weaver and, coalescing their collective powers into a new form they created the goddess Angharradh, a new consort to Corellon and an equal to him in power. Araushnee was swiftly defeated by Angharradh. Corellon looked upon the defeated form of his betrayer, mother of his children and once beloved by him, it was then that the First of the Seldarine broken-heartedly cursed his love, Araushnee the Weaver of Destiny, into the form of a hideous spider-bodied tanar'ri, stripping her of her divinity and branding her with the name Lolth and casted her into the Abyss, never to return. Corellon also banished Vhaeraun, knowing of his son's duplicity and involvement in his mother's plots. Though Corellon knew his daughter's innocence, Eilistraee chose to share the fate of her mother and brother, the Dark Maiden no doubt sensing that the dark elves would one day need a reprieve from the path of hate and evil that they would eventually set upon, following their dark goddess; their Spider Queen.
In the Abyss, many millennia passed by as Lolth raged bitterly over her failed plans, along the way rejecting the advances of Ghaunadaur and sending it into a terrible rage, during which it stole the intellect of many of its followers, effectively robbing itself of most of its power, power which it has only recently regained. However, the Queen of Spiders learned an important lesson from That Which Lurks, by gaining the worship of mortals she could return to her former level of power and beyond. Revealing herself to the dark elven races on various worlds, especially Abeir-Toril, Lolth regained her divinity, achieving part of her ultimate goal to wreak terrible vengeance on Corellon Larethian and the Seldarine. Lolth was the secret power behind many of the dark elven houses of Ilythiir during the terrible Crown Wars that waged between the great elven empires of an age long ago. When the clerics of lost Illefarn prayed to the Seldarine for salvation from the evil elves of Ilythiir and the avatar of Corellon Larethian cursed all Ssri-Tel'Quessir to share the fate of their Abyssmal mother, naming them dhaeraow and divorcing them from the light of day, Lolth led her people into the Underdark, mirroring her own fall from Arvandor so long before. Again, Lolth broke Corellon's heart with this Descent. The dark elves were sundered forever from their creator and all Tel'Quessir, and again Lolth had taken another step in her quest for vengeance against Corellon and his Seldarine.