Ironfoe is a very rare and powerful hammer. It is the twin weapon of Ironfel.
The proc on the weapon causes the wielder to speak only in Dwarvish for ten seconds. This is effective for Alliance and Horde alike, and allows a Horde wielder to communicate with nearby Alliance dwarves through /say and /yell.
Ironfoe, the legendary orc-slaying hammer, was forged by Franclorn Forgewright. While he kept its twin, Ironfel, for himself, he bestowed Ironfoe to Marshal Windsor's ancestor, which was then passed down each generation to him.
Last seen in Blackrock Mountain, Ironfoe was taken from Marshal Windsor when he was captured by Dark Iron dwarves. It is now in the possession of Emperor Dagran Thaurissan himself, and can be seen in his grasp. Ironfel was given to Fineous Darkvire, who succeeded Forgewright after his death as the new Dark Iron Chief Architect.
The hammer is named after the legendary dwarven smith Kaltor Ironfoe, who forged battleaxes which also bear his name. Three are known to exist, two of which are in dwarven hands. The third is believed to be lost somewhere in Felwood, and may be in the Burning Legion's control. An ironfoe is crafted from a single, massive block of dark iron, sculpted into a perfectly symmetrical shape. Dwarven runes are carved in relief on its surface, suggesting (correctly) that this is a weapon of great power. An ironfoe is a dark iron battleaxe of instinct that feels perfectly comfortable in its wielder's hand, despite its obvious heft and weight.
Patch 1.3.0 (07-Mar-2005): Fixed a bug that was causing Ironfoe to have an additional attack when the effect went off.