Hammer of Karak Drazh

The Runelords of Karak Drazh wrought wonders the likes of which had never been seen before, or since, but even amongst their treasure hoards, there was one hammer that stood out as exceptional. It was struck with runes so that it could be swung with preternatural ease, yet it hit with a bludgeoning force — its blows sending shock waves emanating outwards in ripples of concussive force. The weapon was feared lost forever with the fall of Karak Drazh, yet thousands of years later, it has again been recovered.

Source

 * Warhammer Armies: Dwarfs (8th Edition) - pg. 58.