Under the glass road north of Central Spawn.
dates unknown, New Generation Era
Zion is a deep pit, from the surface down to layer 7. The bottom is a garden, the ground covered in grass, with trees. People have built houses into the walls of the pit, and glass walkways crisscross the open space of the pit at fairly regular intervals. Slimes spawn plentifully in the garden, making it a prime slime-hunting ground.
There are far more mushroom farms in Zion than there is resonable explanation for.
One day, shortly after the Return, Friti began to dig. He dug deep and wide, and enormous pit. In time, others came to help, and they built homes in the walls to protect themselves from the horrors of night. This eventually became what is now known as Zion.