Teron'gor

Teron'gor was an orc warlock, leader of the Gorebound, he was a servant of and a member of the. He was charged with infiltrating the draenei mausoleum of, where he was defeated by a group of adventurers and fell into the depths of the complex.

After consuming hundreds of draenei souls, Teron'gor transformed into a bloated abomination known as Gorefiend and was transported to, where he was once again defeated.

Biography
, Teron'gor, and Gul'dan were captured by the Iron Horde and used to power the in Tanaan Jungle. Adventurers freed them in order to destroy the portal and stop the Iron Horde's invasion of Azeroth.

Later, Gul'dan sends Teron'gor to to infiltrate the  and "bleed them dry." Throughout Talador, Teron'gor attempts to gather the pieces of the Heart of Auchindoun and make his way inside the sacred mausoleum. His attacks on and the Tomb of Lights are fought off by the Auchenai and Sunsworn. Teron and Gul'dan are confronted by and Lady Liadrin in the scoured Remains of Xandros, though instead summon the pit lord Mongrethod to deal with the intruders.

With the help of a traitor in the Auchenai's ranks, Gul'dan and Teron are able to enter Auchindoun's inner grounds while Maladaar and Liadrin are kept at bay by Mongrethod. Killing a swath of its defenders, Teron enters Auchindoun to acquire his much-coveted bounty of departed souls upon which to feast. In addition to feasting on souls, he was helping the Shadow Council raise warriors interred at Auchindoun to create draenei constructs.

His blood was requested by Khadgar. When the adventurers attacked the warlock, he began harvesting more power. In the end, he fell off the plateau.

Gorefiend
Falling into the heart of the mausoleum, Teron'gor gorged upon hundreds of draenei souls, becoming a bloated abomination in the process. More than just an orc now, Teron'gor gave up his old name and has taken a new one: Gorefiend.

sent Tyrant Velhari to bring Gorefiend back to, allowing Gorefiend to feast upon the souls of those orcs who were not strong enough to survive their fel transformations. Despite all the power he amassed, Gorefiend was killed by the invading adventurers.

Objective of

 * A Grave Mistake
 * No Rest for the Noble
 * Auchindoom!
 * No Rest for Auchindoun

Trivia

 * At BlizzCon 2013, Dave Kosak said Teron'gor was "not Gorefiend yet", possibly hinting at his eventual transformation.
 * Teron'gor is voiced by Fred Tatasciore.
 * Teron'gor is wearing Betrayer Regalia, the warlock Mists of Pandaria Challenge Mode set.

Speculation
In Hellfire Citadel, he was classified as a demon. Thus it is unknown whether he was truly killed or sent to the Twisting Nether.