The Planetarium

 is an alternate final stage Environment introduced in the Survivors of the Void expansion. The Planetarium can be accessed by clearing all the Deep Void Signals within the and entering the Deep Void Portal, or alternatively by petting the glass frog on  10 times after defeating.

Description
The Planetarium is an area somewhere within the Void, housing a collection of planets detained by the Void's denizens. It is inhabited primarily by the, the guard of the Planetarium or potentially the controller of the Void itself.

Planets orbit around a floating torus-shaped landscape, where the Voidling first makes their arrival. The area is initially made up of terrain native to the Void, but later moves to other landscapes resembling some environments of, those being , , , , and.

Monsters

 * (Boss)
 * Current Simulated Environment's enemies (second and third phase)

Movement Gauntlets
Between phases of the boss fight, Survivors must advance through a void rift Voidling leaves behind, and will have to navigate a gauntlet that tests your movement ability.

Simulated Environments
For the second and third phases of the boss fight, the arena changes to simulate a random Environment. The selected environment will affect which Monsters spawn during the fight, such as in Titanic Plains, and  in Aphelian Sanctuary. No monsters will spawn in the first environment, which is always the Void itself.

Logbook Entry
The Environment Log for the Planetarium is located in the center of the first ring, floating in empty space. When collecting it, be aware of the Voidling - the Log is past the trigger to spawn the boss, and it will likely try to attack you as you move to retrieve the logbook.

Version History

 * Survivors of the Void Update
 * Added New Hidden Realm: The Planetarium

Trivia

 * Some of the planets orbiting the stage are references to other games.