Abyss of Farewells

The Abyss of Farewells is an area accessible from a pit in Shadowy Caves.

Features
Upon falling from the pit in Shadowy Caves, you end up in a room with broken wireframes. Exiting it is a corridor inhabited by benign wireframe chasers. Taking the double door east of the entrance is a Puni House, and interacting with the heads of the horse benches will make them neigh. Right of it is a snake-like creature, who is the Lesser Guardian, Hesu, in its dormant state. Interacting with it will make the screen flash before disappearing, giving you access to the second basement.

Going down the ladder to the second basement, you can find a cave that leads to a serpentine creature with a beak. Heading over to the staircase will let Urotsuki ride on the creature, returning her to Dream Park's eastern section. Entering the double door here will lead to a room with horse benches, where heading to the tiled floor and interacting with the western wall there leads to a room inhabited by Puni and the Lesser Guardian, Hine. If you have interacted with Hesu in the first basement, it will be present in this floor, where interacting with it once again will give you access to the next basement, accessible from the left ladder from where you have interacted with it.

In the third basement, there's a double door that leads to a room with fenced-off wireframe chasers, and a screen with the Dream Park's environment being shown behind five Puni with different looks moving to the left. Left of this double door is a cave with a small red pillar next to it, and entering it leads to the lair of the Lesser Guardian, Uwa. Interacting with it will make dots indicating its locations in Dream Park appear in the map behind it. Back in the corridor, interacting with Hesu will make it disappear, giving you access to the next floor, accessible from the ladder just below it.

The final basement has Hesu blocking the path, and interacting with it will make Hesu dive into the water. The door just behind the cave's opening is inaccessible. Entering the cave leads to a room with four peeping stones, where the top-right one reads as deciphered: Watar (sic) seeks its own level Mizu no hikuki ni tsuku gotoshi

Just above these peeping stones is Hesu in the water, now in its true form.

Directions
Nexus → Marijuana Goddess World → Dark Room → Tribe_Settlement → Dream Park → Shadowy Caves → Abyss of Farewells

Trivia

 * The area's Japanese name, Sayou-nara (サヨウ奈落) is a play on the Japanese term for "goodbye", and the Japanese name of Lesser Guardian Hesu's lair, Matai-zuka (マタイ塚) is a play on the Japanese term for "let's meet again".