Twin Rocks Wildlife Reserve sat a hundred miles west of Meridian City. It was a large forested area home to a hundred thousand plants, fungi, and animals.
In the center was an expansive lake, 25 mi² in size. While one could see the mountains on the other side, a person couldn't see the shore. It looked like an endless sea that landed on a mountain.
While the park was once peaceful, the Sky Plane cultivators seeded a Spirit Vein inside the lake. A Spirit Vein was a treasure that sucked large quantities of Qi into an area.
It was a precious treasure that created natural cultivation havens in the upper planes. Once a Spirit Vein was present, cultivators would pay large quantities of money to cultivate under denser Qi.