First person that comes to mind would be Tony Jay, who did the voice of The Elder God off of those Legacy of Kain: Soul Reaver games. If the person has to alive (sorry, You didn't specify), probably either Simon Templeman, who did the voice of Kain on all those games, or Mako, who played the wizard off of Conan the Barbarian (not sure He's an actual voice actor per se, but I'd sure love to have that voice for my character though).