Takemikazuchi Shrine

Takemikazuchi Shrine was a temple temporarily located in the Great Tomb of Nazarick in Mass for the Dead.

Background
When Nazarick was invaded by Chaos Beasts, sent by Shiramochi-ō. The entity proceeded to alter not just the minds of the NPCs, but also the internal layout of Nazarick into a place of New Year festivity and atmosphere.

Mass for the Dead Arc
Momonga having stepped out to the 1st Floor of Nazarick to receive Solution Epsilon and the protagonist, finds a Hatsumōde that leads to a changed Nazarick. Instead of being taken to the 4th Floor, the group find 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 defeat 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 write poetry 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.

Layout
The temple was situated in zone where the layout of all the floors below the 1st Floor in Nazarick were merged and changed into an twilight dimension of misty fog and desolate sands. The Takemikazuchi Shrine was the only structure that existed in the desert dimension. The Gates that were normally used to transport to other Floors was located in the shrine.

Trivia

 * The location seemed to be based on Kashima Shrine, where the shrine is dedicated to Takemikazuchi-no-Ōkam, patron Japanese deity of martial arts. In addition the shrine is said to be a pilgrimage location for thousands during the New Year celebration.