The Lost

The Lost was an event that occurred between 2095 and 2097. It was the great battle between the Warrens and the demon Alastair whose only aim was to become the one and only leader of the magical community. He was convinced that the only way to secure it was to deprive the great line of Warren descendants of their magic. The events leading up to this battle were masterminded by Alastair's secret advisor. They hoped that this would stop the Warrens from interfering in Alastair's master plan to become the leader of the magical community, tipping the balance to evil.

Rise of Alastair
Alastair is a very powerful demon, who has been defeated and held prisoner for millions of years. He was released sometime between 2037 and 2038 and grew in power and strength ever since. His moves were kept in secret for many years as the magical community knew nothing about him or his plans. That until early 2090s when he started showing his face. By this time, he already had gained allies all over the globe.

Battle Good vs. Evil
Demons and many other evil beings, attacked with no mercy those who were on the side of good for several years. But Alastair's plan couldn't be complete while there were still Warrens fighting to protect the world and the innocents within. Many innocents, witches, whitelighters, cupids, and other good beings, were killed in the process. The Warrens were no exception as many perished trying to stop Alastair and his followers. Seeing that things were more complicated than he first thought, Alastair he came up with a bold plan to steal the Warrens' Magic, but the only known way to do it was through the Nexus. Reaching the Nexus turned out to be harder than it seemed once the protection around it was enlarged. Even though, Alastair was willing to go all the way through with his plan. Until someday, a Seer showed him that stealing the Warrens' magic to himself would only cause his destruction as he wouldn't be able to hold his own magic and the Warrens' within him. That's when a mysterious ally reached with the solution for Alastair's issue; Deprive the Warrens of their magic without using it for himself. He would still be the most powerful being. They would be powerless and Alastair would complete his plans of ruling the world. He just needed someone in the Warren family that would cast the spell to deprive them of their magic. That person had to be the most powerful witch of the time; Isabelle Halliwell, the most powerful  Charmed One of the time and heiress of the  Twice Blessed power.

Manipulating Isabelle Halliwell
Isabelle and her sisters became the Charmed Ones after their mother and aunts, therefore they became the most powerful witches of their time. But Isabelle was the most powerful of the three as she also inherited the Twice Blessed power once owned by her grandparents and mother before her. That was reason enough for Alastair to reach her and play mental mind games and used what Isabelle loved the most to get her to deprive her own family of their magic.

The Last Battle
Soon

Aftermath
After taking the Warrens' magic, Alastair became unstoppable. The Warrens had no powers to fight him. Still, they didn't lower their arms and some kept fighting. When everything seemed lost for the good side, when Jo Halliwell, and her sisters Peri, and  Patience, using ancient and forgotten knowledge, found a way to trap Alastair.