Summons a Rock Golem to fight for you. Lasts 180 seconds.
Cairne Bloodhoof can find one in The Oracle, chapter 7 of the Warcraft III orc campaign, The Invasion of Kalimdor.
Maiev can find two in The Tomb of Sargeras, chapter 3 of the Frozen Throne sentinels campaign, Terror of the Tides.
Kael and Lady Vashj can find one in The Dungeons of Dalaran, chapter 3 of the alliance campaign, Curse of the Blood Elves.
Illidan, Kael, Lady Vashj and Akama can also find one in Lord of Outland, chapter 6 of that campaign.