Before the people built houses, they had to get food somehow, so they found a natural spring nearby and built a farm.  One day when Ziya was harvesting crops, a huge explosion knocked her over.  When she regained consciousness, she saw fire all over the farm and ran home to tell her brother, Jarmik.  Ziya and Jarmik ran to the farm and saw that the fire was all gone, but there was a crater in one side of the farm.  In the crater there was an extremely rare material, which they named "Endstone", because it brought an end to most of the farm.  The soil of the farm was no longer suitable for growing things, so they mined the Endstone instead.  The people thanked the star god for the blessing of Endstone.

To download this, go to Twilight World.  
When you're in the world, go east to get to the farm.