Combining this with at Urok's Tribute Pile will summon Urok Doomhowl.
As an object Edit
The Roughshod Pike is located in Lower Blackrock Spire.
Directions to find Edit
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. They do have gears when you mouse over.