Helm of Valor (Warcraft III)

Increases the Strength and Agility of the Hero by 4 when worn.

Source

 * Malfurion and Maiev can find one in The Ruins of Dalaran, chapter 7 of the Frozen Throne sentinels campaign, Terror of the Tides.
 * Illidan, Kael, Lady Vashj and Akama can find one in Lord of Outland, chapter 6 of the alliance campaign, Curse of the Blood Elves.