First Evil's dimension

"This isn't some alternate reality, Slayer. This is the First's own dimension. It controls everything here."

- Ethan Rayne to Buffy Summers

The First's hell dimension was a hell dimension created and ruled by the First Evil. It had complete control over the dimension and knew everything that happened within it. In-game, it appeared as a dilapidated and nearly deserted version of Sunnydale, where vampires and demons apparently reign supreme.