Takemikazuchi Shrine

Takemikazuchi Shrine was a temple area temporarily located in Fake Nazarick in Mass for the Dead.

Background
When Nazarick was invaded by a strange Chaos Beasts, some sort of phenomena proceeded to alter not just the minds of the NPCs, but also the internal layout of Fake Nazarick into a place of New Year festivity and atmosphere. According to Momonga the phenomena seems similar to a high tier spell of [Creation] or [Change The World].

Mass for the Dead Arc
Momonga having stepped out to the 1st Floor of Nazarick to receive Solution Epsilon and the protagonist explains them of the strange New Year mood affecting those in Nazarick. To be safe they decide to recall everyone from outside of Nazarick. The only ones that seem to be missing are Cocytus and Narberal Gamma. Their last known appearance was at Fake Nazarick. There to their surprise they finds a Hatsumōde that leads to a strange Chaos Zone. Instead of being taken to the copy of the 4th Floor, the group finds themselves in a desolate desert. There they greet various characters that have been affected by the New Year phenomena.

Coming across the shrine where Cocytus and Narberal Gamma they are barred from going any further unless they battle. The group defeats the two and are allowed to pass where they meet with Yuri Alpha and Lupusregina Beta. When Yuri is asked why she left her post, Yuri replies that it was a holiday. All in all Yuri and Lupusregina appear to be mildly affected by the New Year atmosphere. Though they invite him to write his aspiration for th new year though they are suddenly attacked by Chaos Beasts. After dispatching the monsters the group continue to participate in the festivities before heading through the Gate to the 10th Floor. After the Ruler of New Year was defeated, Fake Nazarick had been restored to as it was.

Layout
The temple was created on the 9th Floor of Fake Nazarick, when the entire layout of of Fake Nazarick weas changed by the Ruler of New Year. The dungeon was converted into a realm with a hazy sky, misty fog, and desolate sands. The Takemikazuchi Shrine was the only structure that existed in the desert dimension. The Gate that was normally used to transport to other Floors was located in the shrine and led directly to the copy of the Throne Room where Shiramochi-ō waited. The roof of the shrine possessed an ornament that was similar to Warrior Takemikazuchi's horns.

Features
Hatsumōde: A Japanese stone tori located on the 1st Floor of the Great Tomb of Nazarick. It is decorated with a gold dharma wheel at the top, with lengths of shimenawa wrapped on either supporting pillars. In the middle of the tori is an amethyst dimensional gateway which serves as an entrance to the converted Nazarick.

Trivia

 * The location seemed to be based on Kashima Shrine, where the shrine is dedicated to Takemikazuchi-no-Ōkami, patron Japanese deity of martial arts. In addition, the shrine is said to be a pilgrimage location for thousands during the New Year celebration.
 * According to the protagonist the area may be a special Chaos Zone created by a Crack as it creates strange humanoid shadows like the latter when it casts light.