Who Is Nivellen in ‘The Witcher’? He’s Making His Debut in Season 2

Nivellen also tells Geralt about the previous women living in his home — Fenne, Primula, Ilka, and Venimira — but he doesn’t say much about his latest companion despite Geralt’s interrogation.

Then, once Geralt leaves for a bit, Nivellen’s most recent lover arrives, and she’s a Bruxa named Vereena. As we all know, Bruxae are quite dangerous creatures, and she manages to lure Geralt into a battle. Eventually, Nivellen interferes with their fight, which leads to Vereena’s death.

Source: https://www.distractify.com/p/who-is-nivellen-the-witcher