Guest Stars Donna Kimball voices Aughra Jason Isaacs voices The Emperor Keegan-Michael Key voices The Ritual Master Benedict Wong voices The General Mark Hamill voices The Scientist Gugu Mbatha-Raw voices Seladon Caitríona Balfe voices Tavra Simon Pegg voices The Chamberlain Victor Yerrid voices Hup Harris Dickinson voices Gurjin Neil Sterenberg voices The Scroll Keeper Awkwafina voices The Collector Kevin Clash voices Gruenak #1 Warrick Brownlow-Pike voices Red-Haired Paladin Harvey Fierstein voices The Gourmand Warrick Brownlow-Pike voices Podling Servant #1 Lena Headey voices Maudra Fara Toby Jones voices Librarian Ólafur Darri Ólafsson voices The Archer Hannah John-Kamen voices Naia Shazad Latif voices Kylan Alice Dinnean voices The Ornamentalist Louise Gold voices Podling Servant #2 Damian Farrell voices Lore Theo James voices Rek'yr Nina Sosanya voices Maudra Mera Nimmy March voices Maudra Laesid Kemi-Bo Jacobs voices Maudra Seethi Beccy Henderson voices Maudra Ethri