Sylvia Anna

Sylvia Anna, also known as Syanna, is the main antagonist of the Witcher 3 Expansion Blood and Wine. She is the older sister of Duchess Anna Henrietta of Toussaint but was banished from the country.

History
Syanna was born during a total eclipse and was thought to be under the 'Curse of the Black Sun'. Due to the way everyone behaved around her, Syanna became bitter and played cruel tricks on other people. These tricks eventually became fully evil - marking their peak when Syanna told a young nobleman that she could dream the future. She told the man that she had seen that the man's brother would kill him. To save himself, the man killed his brother and has been emotionally scarred ever since. For this, Syanna was banished from Toussaint. She was escorted out of the country by four knights who, despite their vows of chivalry, abused her, beat her and mocked her on their way out of the country. After the knights left her, Syanna vowed revenge on them as well as on her sister who she wanted to see dead for her cold-heartedness.

In order to achieve her goal, Syanna took on the alias Rhena and seduced the higher vampire Dettlaff van der Eretein. After Dettlaff fell in love with her, she staged her own abduction and sent a forged letter to Dettlaff, claiming that she would be killed by kidnappers should Dettlaff not kill five people of Toussaint who had each broken a different part of the chivalry code. She then sent cards to Dettlaff, each card containing the name of the target and the way the target had to be killed (which was mocking the chivalry code the person broke). After Dettlaff had commited four murders, Geralt, who tried to free Rhena from her kidnappers, found out that Rhena and Syanna were the same person and that Syanna had used Dettlaff to kill the knights who abused her during her way to exile - the chivalry code only being a pretext to hide her true motives.

When Dettlaff finds out, he furiously demands that Syanna explains herself to him, otherwise he would destroy Beauclair. When Syanna, who is imprisoned at the palace, is not handed out to him, Dettlaff attacks the city with a horde of vampires. Depending on Geralt's choices, Syanna can either reconcile with her sister Anna Henrietta, or fake forgiveness to stab her sister with a hair pin - killing her. In the latter case, Syanna is immediately shot by Annarietta's guard captain with a crossbow to the mouth.

If she is brought to the meeting with Dettlaff, Dettlaff kills her.

Journal entry

 * Sylvia Anna ... A lovely name, don't you think? This beauty should come as no surprise, given it's the name of the daughter of a duke and sister of a duchess. Yet the fate Syanna (as her intimates called her) met was not so beautiful as might have been suspected for one so well-born - though, as it turns out, she had in truth been born eahter inopportunely. She came into this world during an eclipse and thus fell victim to the panic surrounding the Curse of the Black Sun, which was said to affect young girls from ruling families birthed in similar circumstances. Though Geralt had serious doubts whether this curse truly existed, many claimed it caused horrible mutations which filled its victims with cruelty and a desire to kill.
 * Syanna's parents certainly seemd to be among the believers in the curse, for they deemed her too dangerous to be allowed to remain at court and forced her into exile. Syanna then fleed to Nazair and soon, for all intents and purposes, dropped off the face of the planet.
 * Anna Henrietta, full sisterly love and compassion, spent years mourning the absence of Syanna, who had officially been declared missing and presumed dead. When she surfaced again, however, their reunion was not one of familial joy. Syanna despised Anna Henrietta and did not wish even to speak to her.
 * This reluctance might have had something to do with the fact that, moments earlier, Syanna had been unmasked as a murderer ...
 * Geralt's journey to the Land of the Thousand Fables bore more fruit than he had expected. His conversations with Syanna shed light on a few matters: she made no secret of the fact that her elaborate murder plot was about getting revenge on the people who had forced her into exile. Vengeance is one of the oldest motives in the world and has brought many doom and few relief. It was to bring Syanna face to face with a higher vampire who was simultaneously a serial killer, her slighted beau and, it seemed, a beeing still deeply in love with her ...
 * When Geralt brought Syanna to the meeting with Dettlaff, he never expected this story would end with sich a final. Though several days had passed since their last meeting, Dettlaf had not managed to rein in the wrath he felt toward Syanna. 

Trivia

 * Syanna is the cousin of Niilfgardian emperor Emhyr var Emreis.