100% Hit Chance
Pounds the ground, dealing 236 Mechanical damage to the enemy and half that damage to their backline pets.
Quake continues and increases in damage for 3 rounds and can affect enemies underground.
Drop: Karr the Darkener 
Zone: Dread Wastes
Approximate Drop Rate: 1 in 11
World Event: Feast of Winter Veil
Quest: You're a Mean One...(Alliance)/(Horde)
Approximate Drop Rate: 1 in 65 (available 14 days per year)
Achievement: Rock Lover
Profession: Engineering 
Taught By: Goblin Engineering Trainers
Drop: Void Reaver [??+]
Zone: Tempest Keep
Approximate Drop Rate: 1 in 13