Guest Stars Donna Kimball voices Aughra Mark Hamill voices The Scientist Jason Isaacs voices The Emperor Keegan-Michael Key voices The Ritual Master Benedict Wong voices The General Gugu Mbatha-Raw voices Seladon 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 Warrick Brownlow-Pike voices Podling Servant #1 Louise Gold voices Podling Servant #1 Harvey Fierstein voices The Gourmand Lena Headey voices Maudra Fara Toby Jones voices Librarian Ólafur Darri Ólafsson voices The Archer Neil Sterenberg voices Gruenak #2 Hannah John-Kamen voices Naia Shazad Latif voices Kylan Ralph Ineson voices The Hunter Alice Dinnean voices The Ornamentalist Andy Samberg voices The Heretic Bill Hader voices UrGoh the Wanderer James Dreyfus voices Lath'N Louise Gold voices Maudra Argot Natalie Dormer voices Onica Suzy Eddie Izzard voices Cadia Dave Goelz voices Baffi Nina Sosanya voices Maudra Mera Nimmy March voices Maudra Laesid Beccy Henderson voices Maudra Ethri Kemi-Bo Jacobs voices Maudra Seethi