Zevo helps the Viper witchers sneak into the most heavily fortified place in Ellander, hoping to learn more about the Wild Hunt.
The Witcher novels are written by Andrzej Sapkowski: https://www.hachettebookgroup.com/series-list/andrzej-sapkowski-witcher-books-in-order/
The Witcher video games are created by CD Projekt Red: https://thewitcher.com/en/
The Witcher Tabletop RPG is created by R. Talsorian Games: https://rtalsoriangames.com/category/the-witcher/
Music by Eric Matyas: soundimage.org