Guest Stars Donna Kimball voices Aughra Keegan-Michael Key voices The Ritual Master Gugu Mbatha-Raw voices Seladon Benedict Wong voices The General Mark Hamill voices The Scientist 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 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 Mark Strong voices Ordon 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 Charlie Condou voices Mitjan Beccy Henderson voices Bobb'N