Land of Fate

Also known as the mythical Underground, is where the whole point of the AU began. After the Great Underground War, monsters called the entire area as the Land of Fate, with a choice of a world that pleads the 'kill or be killed' antics, or 'live or believe' ideal. The war lasted for months, dividing the entire Underground into two; Lux and Stygia.

Lux
Lux was known as the Light Kingdom of the Underground. Due to the mercy of the Queen, the cavern entrance to the Underground, and the fact that the location of the seven souls was found in this place, massive light energy resides in this bright, and lively side of the entire area. Queen Toriel rules this part of the Underground, yet while they were considered powerful, they own only a handful of land in the Underground; The Ruins, and Buttercup Field.

The Ruins

Like the original Undertale, and every other AU, the Ruins was a place in which Toriel dwells. It holds up catacombs, puzzles, and many other residences. Unlike the typical Ruins, however, instead of the usual purple colored brick walls, and red greenery, the walls were made up of cream-colored bricks, as well as golden vinery. Everywhere you look, it seemed as if it was daytime, due to the intense light it emits, just as torches, and chandeliers were always lit. It was forbidden for any darkness to be seen here.

Buttercup Field

Here lies the cavern entrance of the Underground, where fallen humans land on a patch of golden buttercup flowers. This patch grew throughout the years, covering up large quantities of the land, enough to be called as a region itself. Buttercup Field was known as the Waterfall of Lux, except, well, there’s no water, just flowers.

Stygia
Stygia, the Dark Kingdom of the Underground, was where King Asgore reigned. Everything seen here was what one expects as the counter-kingdom of Lux. As expected, light was not allowed in this place, resembling the hollow and obscure heart of their king. While it seemed to be a treacherous, and dreary location, they own much larger spans of regions; Waterfall, Hotland, and New Home. One thing that one should note about, upon entering this place, was that it was wintery cold.

Waterfall

Waterfall is the entrance to Stygia. While light was prohibited in the area, who is capable enough to extinguish the natural glow echo flowers give out? None, and as much as they would like to keep the darkness, the said flowers are their source of radiance to lead their way.

Hotland

The usual Hotland was extremely hot. But because of the core bringing a massive override, caused by the war, most of its energy found its way to Lux, and underwent an eternal cool down in all of Stygia, resulting to the everlasting winter the whole area was buried in. Hotland, was considered as the coldest of the three Stygian regions, its magma turning to ice cold flowing mush, with most of its volcanic rocks transforming into massive ice bergs.

New Home

The capital of Stygia, New Home is where the main Stygian Dreemurr palace was located. Just like before, it was made up entirely of dark grey bricked walls, its surface expected to be as ice cold. What was pretty specific about this region, is that the Last Corridor and the Barrier was here, so it is considered impossible for anyone to get out, unless of course, the seven souls were provided.

Snowdin
Snowdin was never mentioned to be part of any of the two kingdoms, however, it is likely that it belongs to the dark kingdom of Stygia. Known as the Border that separates the two kingdoms of the Underground, Snowdin was the only region whose features were not altered. As always, it takes on the winter landscape, only nightmarishly dimmer at night, and beautifully bright at daytime. Only two monsters inhabit this region, and served as the Guardians of the Border.