From Halopedia, the Halo wiki
Robin Atkin Downes (born September 6, 1976) is an English voice actor. He voiced the Prophet of Regret in Halo 2, Halo Wars and the Halo 2: Anniversary terminals, in which he also portrayed the San'Shyuum scribe. He is also known as the voice of the Prince in Prince of Persia: Warrior Within, Luxord in Kingdom Hearts II, Origin and Botta in Tales of Symphonia, Cyclops and Pyro in X-Men. He has also done voices for a number of other notable games, such as Gears of War, Gears of War 2, Mass Effect, and Team Fortress 2.