Roughshod Pike

Combining this with Omokk's Head at Urok's Tribute Pile will summon Urok Doomhowl.

Source
The Roughshod Pike is located in Lower Blackrock Spire. Directly across the room from the entrance to the room with the Ogre boss, you'll see two sleeping Scarshield Legionnaires. On the wall behind them are your pikes waiting for you to pick them up.