Grommash Hellscream (better known as Grom Hellscream or simply Grom) is a central character in the Warcraft universe. He was the founder and longtime chieftain of the Warsong clan, was a big brother figure to Warchief Thrall, and the father of Garrosh Hellscream, the last orc Warchief of the Horde. Due to Garrosh's meddling with time and forming the Iron Horde, Grom became the warchief of the Iron Horde and the main antagonist turned anti-hero of World Of Warcraft : Warlords Of Draenor.