The Witcher website offers a video showing the magnificent Charles Dance performing some of his lines from The Witcher 3: Wild Hunt, along with more details on the actor's first appearance in a video game:

Watch Charles Dance (Game of Thrones, Dracula Untold, The Imitation Game) perform for the first time as a video game character: Emhyr var Emreis -- ruthless Emperor of Nilfgaard.

“It’s a dream come true for the team here at RED to be able to work with such an accomplished actor and magnetic personality,” said Marcin Blacha, Lead Writer for The Witcher 3: Wild Hunt.