Celestial Realm

Overview
The Celestial Realm is one of the three worlds that exist in the game. It's the home of angels such as Simeon and Luke, and the former home of the demon brothers prior to their fall from grace following the Great Celestial War.

Little is known about the realm, but Luke stated that it was constantly daylight all the time (even during the night), which is the polar opposite of Devildom, where it is dark all the time. In the chat Body Pillow Specifications, Belphegor mentions that angels have higher body temperatures than demons.

It's currently unknown who rules over the realm.

Angel Hierarchy
There are several types of angels mentioned in the series:


 * Seraphim: angels with six wings and the highest ranking in the Celestial Realm. Lucifer was formerly a Seraph. Simeon was also a Seraph before the Great Celestial War.
 * Cherubim: a high-ranking angel that is known as a guardian. Beelzebub was formerly a Cherub.
 * Throne: a high-ranking angel. Mammon was formerly a Throne and was recommended the position by Lucifer. Little is known about them, but Mammon was Lucifer's assistant.
 * Dominion: a type of angel that watches over the Human World, according to Simeon.
 * Principality: a type of angel mentioned by Mammon when teasing Luke.
 * Archangel: an angel that serves as warriors, according to Luke. However, Michael is commonly referred as an Archangel despite his high ranking. Mammon was also an Archangel before being promoted to Throne. Simeon is currently an Archangel.

Angel's Trial

 * The Angel's Trial is a test that all angels have to pass in order to be allowed to serve in the Celestial Palace. In order to pass the trial, one must not lie for an entire day. (Nightbringer Lesson 30-5)
 * To begin the trial, an angel must bestow it upon the person who will undertake the trial. A bracelet will then appear on their wrist as a sign of the Angel's Trial. If the bracelet snaps, then it will be revealed they have lied. (Nightbringer Lesson 30-7)
 * In Nightbringer Lesson 30-11, the true goal of the trial is revealed. The purpose of the trial is to make one understand the essence of a lie. It wasn't important whether a lie was told or not, but whether one tells a lie in order to protect someone or lies for their own selfish reasons since angels don't tell lies that hurt others.