Serrit and Egan are witchers turned kingslayers and minor antagonists in the videogame Witcher 2: Assassins of Kings. They were assigned to assassinate King Henselt.
Witcher 2: Assassins of Kings
If Geralt decided to help Iorveth, he will never encounter them, but will hear that they died during an attempted assassination on Henselt.
If Geralt decided to help Vernon Roche, h encounters Serrit and Egan for the first time during an assassination attempt on Henselt in the Kaedweni camp. He fights them and mortally wounds Egan, but Serrit escapes. With help of Dethmold Geralt takes memory of Egan's last day in a form of dream to locate his hideout. He also discovers that Sheala de Tancarville is behind assassination of King Demavend. When Geralt reaches the Serrit, he's mortally wounded by Sheala's golems and gargoyles. Before Serrit dies he reveals that Sheala is behind the regicides and she tries to destroy all evidence.
The Witcher 2: Assassin of Kings
The Witcher 3: Wild Hunt