Hearthstone is the ancestral home to the Dwarf race. Following the fall of the Elders, it was invaded by and conquered by orcs, who then began to invade Axyss when the portal from that world was subsequently opened from the other side. With the destruction of the Elder Gate in Khul that ended the Second Gate War on Axyss, the remaining dwarves were trapped once more as slaves to their orc masters.
According to Ulrick Torunn there are an estimated million orcs on Hearthstone, compared to approximately 250,000 enslaved Dwarves.
Hearthstone’s surface is almost entirely rugged mountains. The Dwarves themselves did not inhabit the unforgiving exterior of their world, only maintaining a few ‘embassy’ villages to trade with other races who did not favor being ‘trapped’ beneath the earth for negotiations.