Hellscream was the first to partake of the Blood of Mannoroth, eventually coming to regret it. When Thrall met him, it was clear to him that Grom had the means by which to liberate his lethargic brothers and sisters.
During the second coming of the Burning Legion, Hellscream took his axe to the pit lord Mannoroth after Thrall was beat into unconsciousness. With a single blow, Hellscream cleaved his adversary's weapon in two and slew Mannoroth. Hellscream perished shortly afterwards, but he had managed to break the curse over his people, freeing their souls and spirits from the demonic curse forever.
This section concerns content exclusive to the Warcraft RPG, and thus is not necessarily canon.
Grom Hellscream’s axe has a heavy blade that is notched and stained, with sharp, wicked curves. Small holes dot the blade near the handle; when the wielder swings the axe, air whistles through these holes. The sound keens over the battlefield, magically strengthened and imbued with otherworldly power. Gorehowl is one of Azeroth's most feared and notorious weapons.S&L 169
Speculation
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.