From 2005 to 2007, Uelmen created some of the sound and music for Blizzard's popular MMORPG, "World of Warcraft"s expansion pack, ""; his work represents the majority of the music in the new area of the game, Outland. He is one of about ten composers who have contributed to "World of Warcraft". After his departure from Blizzard, his work was used as the basis for some of the tracks in the Blizzard Entertainment and Eminence Symphony Orchestra collaboration, "Echoes of War" (2008).