Valakun Stones

The Valakun Stones are extremely powerful artifacts, their origins are unknown though they act as scrying stone, allowing for communication across vast distances, though in this case they are a direct link to the masters of the once plentiful Old Gods of Azaroth before their imprisonment. Each defiler of the planet had it its possession one of these stones, allowing them to receive orders from there Void Lord creators. Due to this, they are not only extremely rare, but very dangerous, said to drive the unprepared mad with visions that could make the strongest of willed people wilt in an instant. There are three known and named stones currently on the world of Azaroth.

Shel'Nah Stone
The stone of Yogg-Saron, destroyed by the titan keepers after the events of Ulduar.

Naka'Nah Stone
The stone of C'Thun, lost in the deserts of Uldum by Harrison Jones on his way back to Stormwind after Belloc Brightblade attempted to ransack his caravan.

Anore'Nah Stone
The stone of Y'Shaarj, lost to the ages after he was ripped from the planet, it is assumed that the Highborne recovered the item and hid it away near the city of Suramar before the war of the ancients.

It has since been uncovered and come into the possession of the Burning Legion, despite the efforts of the Dominion of the Sun.