Cho'gall (alternate universe)

Cho'gall is a two-headed ogre. He seems to have betrayed the Gorian Empire in order to further his own power and later becomes a servant of and a member of the, but ultimately betrays them as well, after gaining knowledge and power from the naaru, , and subjugates the Pale in the process in order to lay siege to Highmaul and claim the ancient stones wielded by.

Warlords of Draenor
Cho'gall, 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, the ogre magi had awoken Shui Halad from her slumber. The Horde adventurer arrived just as Cho'gall detected their presence in the area. While spying on the Shadow Council, Gul'dan sent Cho'gall to to subjugate  within it. After transforming K'ure into a Void state and becoming empowered, Cho'gall turned against Gul'dan and ventured to Highmaul.

However, upon arrival in Highmaul, Cho'gall was imprisoned. After was defeated, Cho'gall broke free and unleashed his Pale servants upon the city. He then disappeared into a portal as Mar'gok fled, aiming to seize the Stones that the line of Sorcerer Kings have held for generations.

On Mythic difficulty, Cho'gall arrives during the encounter with Imperator Mar'gok, seizing the Sorcerer King in a field of dark magic. Cho'gall draws the power of the Stones from Mar'gok's body, killing him in the process, before attacking the raid. Cho'gall eventually falls, leaving a cryptic warning that his new master is drawing close to Draenor.

Trivia

 * In the earlier lore, Cho'gall was referred to as the first of the Ogre-Magi, but the recent lore indicates that Gorian Empire was ruled by a dynasty of sorcerers, with Imperator Mar'gok being the latest descendant of this line. Cho'gall himself was most likely affiliated with the Gorian, but betrayed them in pursuit of power, and later returned to Highmaul in order to kill Mar'gok and claim his ancient stones.
 * Cho'gall's model resembles a mixture between his original Prime universe form, and his mutated form as he possesses the altered body structure and rocky protrusions from his mutation (and strangely also possesses the 'x' scars that were derived from the Second War), but lacks the eyes. It is unknown why the Disciples of Cho'gall model wasn't used; scar aside, it closely resembles Cho'gall's original appearance.