Nightosphere (IRR)

The Nightosphere is a demon world connected to the land of Ooo. It can be accessed by many ways from there, but nowhere else.

How to get there

 * 1) First draw a happy face on a surface.
 * 2) Douse the face with some bug milk.
 * 3) Chant, "Maloso vobiscum et cum spiritum!"

Trivia

 * "Maloso vobiscum et cum spiritum" roughly translates from Latin to: "Evil be with you and with your spirit." This phrase may be a reference to the Catholic liturgy, where the priest says "Dominus vobiscum" ("The Lord be with you"), and the congregation responds "et cum spiritu tuo" ("and with your spirit").
 * The Nightosphere bears similarities to Hell in appearance. In addition, Finn states, "I'll see you in the Nightosphere, you sick freak," which is similar to the phrase "I'll see you in Hell."
 * The Nightosphere also exists in the gender-swapped universe, as Marshall Lee claims to be from there.