Cassandra Thorne

"By killing us, humans declared war. We should have retaliated. If we had only conquered or killed them for what they did, you people would be welcoming our return by now!"

- Cassandra to Ash Cassandra is a Witch of Old Salem and serves as the primary antagonist for the whole novel.

Pre-ASFS
At some point, Cassandra married a man named Richard and gave birth to two children, Thomas and Grace. It is possible that this was in an attempt to hide the fact that she was a witch. Cassandra's coven was somehow revealed, however, and she, along with her husband and children, were hanged for witchcraft.

Hundreds of years later, Cassandra's spirit—still vengeful—managed to convince and turn Joshua Hamilton to her cause.

ASFS
Cassandra's first appearance comes in the form of the vision that Wand of Water shows Mary, in which she slaughters a Lamb in order to perform a spell. It is here where the Wand tells Mary about the plot to bring the Witches of Old Salem back to life.

Cassandra next appears in Ash's dream. They argue over her reasoning for coming back to life. She tells him that she wishes to rule over humans as their superiors and that she will have her sacrifice "sooner or later".

After the attack on the Rainbow Bridge, Mary sees Cassandra in another vision. She shows her the death of her family and tries to convince her to help her take revenge. Mary denies her and Cassandra states that she will show no mercy.

As the Salem Four get closer to their destination, Cassandra returns to Mary in a dream, telling her to come to Salem common alone so that she may be the "only sacrifice". This does not go as planned, however, and Florence Gale is killed by Marcus after a rescue attempt. This then triggers the return of the Witches of Old Salem. The group, along with Callum and Damian, fight them back enough to stop the return of the other witches, but Cassandra manages to return from the dead—escaping before they can stop her.

Melanie
Cassandra had a close relationship with Melanie prior to their deaths. It was her who warned Cassandra that their coven had been exposed.

Beatrice
Unlike her relationship with Melanie, Cassandra and Beatrice's relationship was more strained, with the latter calling her "cruel". However, this does not seem to have affected her loyalty to her coven, as she is the one who produced the wave on the Rainbow Bridge in an attempt to capture Mary. Furthermore, she is present at the battle at Salem and fights the Salem Four.

Mary
Cassandra and Mary completely oppose each other. Their views on each other are completely different. Despite this, Mary cannot help but feel sympathetic towards her enemy after being showed the death of her and her family.

Ash
Cassandra seems to vent her frustration towards the modern magical society at Ash, accusing him of wasting their opportunity to take over humanity.

List of People Killed

 * Numerous humans (presumably)
 * Florence Gale (indirect)

Trivia

 * Having been born in the 1600s, Cassandra is the second oldest witch to appear so far, the oldest being Merlin.
 * In The Purging of Magic, it is revealed that Cassandra is an air mage.
 * Cassandra's corruption of Joshua Hamilton will be explored in A Place of Teaching.