Senjōgaharaせんじょうがはら

Akagi Daimyojin is the deified embodiment of the entirety of Mount Akagi, which towers over the northern edge of the Kanto Plain. Rather than a singular anthropomorphic god, it strongly exhibits the nature of a "deity of place" that governs the mountains, swamps, forests, and springs. Consequently, it has been depicted in multifaceted ways over time—associated with Toyoki-irihiko-no-mikoto, Oanamuchi-no-mikoto, or even the goddess Akagi-hime. Its transformation into a giant centipede (or serpent) in the Battle of the Gods represents its fierce, combative aspect, forming a stark contrast to its gentle demeanor as a deity of agriculture and water during times of peace. The fact that real geographical locations like Senjogahara, Akanuma, and Oigami are all narrated as remnants of this divine battle suggests how deeply these legends are rooted in the local landscape. The cycle of tales featuring the Nikko deity as an adversary is essentially a mythologization of the border disputes between the former provinces of Kozuke and Shimotsuke. The variations in avatars and outcomes (whether Akagi is the centipede or the serpent, the victor or the vanquished) are direct reflections of the regional pride embedded in each area.

The Daija of Senjogahara is the avatar taken by the god of Mount Nantai (Futarasan) to fight for dominion over the lake. When uncoiled, it is long and massive enough to cover half of Lake Chuzenji. Its scales shine like wet obsidian, and its eyes harbor the phosphorescent glow of the lake bottom. It summons water, raises fog, and stirs waves upon the lake's surface to hinder its foes. Initially pressed hard by the giant centipede of Mount Akagi, it is said to have turned the tide by borrowing an arrow from a human master archer—preserving a form of worship where mountain and village intersect, showing a god winning through human assistance. The traces of this victory and defeat became the place names Akanuma, Shobugahama, and Senjogahara, which are etched into the landscape of Oku-Nikko to this day.

A famed form tied to legends of Mount Mikami in Ōmi and the shores of Lake Biwa. Said to coil around the mountain seven and a half times, its shell is as hard as metal or stone, impervious to arrows and blades. At night its legs gleam crimson, casting a long shadow over the lake and mountain skirts. Tales of its slaying are linked to martial valor and understood in relation to dragon-god worship and the numinous power of bridges. Connections to mining and blacksmith lore have been noted, though details remain unclear.