A Shrine dedicated to Yamarochi no Yomi found in the capital city of Shio. It is said that this shrine is a portal or gate to the Underworld of Yomi, but is constantly watched over by Yamarochi himself. In recent times the shrine has fallen into neglect as war ravages the landscape. Whether the site is truly a place one can travel to the underworld is unknown, but there have been instances where people have tried, and it's mused they ultimately succeeded since they were found dead at the base of the shrine.
In the heart of Shio, the capital of Uikku, stands Yomikage no Jinja, a shrine dedicated to Yamarochi no Yomi, the overseer of the spirit realm. Built with dark tiles and decorated with dragon and serpent carvings, this shrine is rumored to be the direct passage to the underworld of Yomi. Centuries back, the shrine thrived, with priests and shamans seeking Yamarochi's wisdom through sacred rites. The stone serpents surrounding it, believed to be Yamarochi's emissaries, occasionally gleamed with an ethereal glow during dusk, indicating the spirit's presence.
At the shrine's core is the Altar of Whispers, where once offerings were made, and mourners claimed to hear soft voices from the beyond. However, war's toll led to the shrine's decline. Its priests vanished, and rituals became tales of the past. Overgrown foliage now masks its former grandeur, with only adventurers and an occasional mourner visiting its precincts.
For individuals like Kazuhira Orochi, the shrine remains pivotal. His transformative encounter with the serpents here made him a Spirit Samurai. As Oni rise and the spirit world trembles, some believe that restoring the shrine could bring back harmony between the realms.

Japanese Shinto Shrine of the Serpent - Yomikage no Jinja  is created by DM Stash and suitable for any table top rpg or wargame.

Looking for some models in the same set check Spirits From the East collection.