FantasyLand is a simulation using Monogon's MythOS framework, it was quarantined by Monogon after the NPCs of Heaven's Reach began developing sentience, it was a medieval-themed simulation being made outside of MythOS, StressLevelZero was likely building it when MythOS went into lockdown, StressLevelZero continued to develop FantasyLand, later releasing it, eventually, the NPCs began to demonstrate sapience, and Heaven's Reach was removed from the simulation for study.