Once upon a time in a far away there was an ancient civilization build in the center of the Earth known as the Rune Kingdom. A very advanced kingdom, using technology to create marvelous tools. The other humans on the surface were living in envy and decided to take over the Underground Heaven. After decades of war the underground kingdom prevailed, even though their armies were greatly outnumbered. The victory corrupted one of the Rune Kingdom's generals who decided to invade the Upper World. The remaining Royal Rune Soldiers tried to stop him but lost the fight. And so the story began.