Beneath Hyrule Castle

is a location in, serving as both the first and final area of the game. It is a forbidden zone that descends into the very deepest part of TotK:'s Series:. A TotK: in the TotK: indicates that the area beneath the castle was originally accessible through the passage. As the entrance evidently collapsed during the Series:, it can now only be reached through the TotK:.

Prologue
After TotK: starts to seep out from below TotK: and makes nearby people fall ill, TotK: tasks TotK: and TotK: with investigating the source, which originates in a tunnel system deep TotK:. Entry to the tunnels below the castle is forbidden to all including the Series:, though the reason why has been lost to history.

Upon arrival to the area known as the TotK:, TotK: notes that the concentration of Series: found TotK: is relatively mild in spite of the effects it has on the people of the TotK:. While investigating, TotK: discovers signs of NaN Zonai Ruins belonging to the ancient TotK: people and excitedly documents her findings with the TotK:. She eventually comes across a series of murals, which she deduces must be about the origin of TotK: and the TotK: that followed. A series of murals to the right of the central relief are concealed by rocks so cannot be viewed.

As they descend further down TotK:, the TotK: grows thicker. Eventually, they stumble upon a mummified body held in place by a TotK:. This TotK: releases its grip on the body when TotK: approaches, causing the TotK: on the back of its hand to fall to TotK:'s feet. When she picks it up, the mummy awakens and attacks with tendrils of TotK:. While defending her against the TotK:, TotK:'s TotK: is heavily damaged and breaks. Before they can muster a counterattack against the mummy, he launches a burst of TotK: upwards, tearing the earth surrounding most of TotK: and sending it into the TotK:. This also causes the ground beneath the three of them to give way, sending them all into freefall. The TotK: in TotK:'s possession begins to glow, causing her to disappear. TotK: is saved by the TotK:, which TotK: him away to the TotK: atop the TotK:.

The Imprisoning War
The area is seen again in Series: #14 "The Imprisoning War". In the distant past, TotK: leads the TotK: in a battle against TotK: TotK: to bring an end to the TotK:. With no other choice but to sacrifice himself, TotK: relies on the TotK: to distract the TotK: long enough to grab hold of his chest and bind his heart, simultaneously draining his TotK: in the process. This sacrifice traps both of them in place for millennia while TotK: waits for TotK: and TotK: to arrive in the TotK:, where they can destroy TotK: with the TotK:.

Entrance to Beneath Hyrule Castle
The area is revisited for the final Series: to TotK:. TotK: is convalescing TotK: in the TotK:, and can be faced here at any point after returning to the surface from the TotK:. However, Link will only learn of the Demon King's location after defeating TotK: at the TotK:.

The destruction wrought by the Series: has collapsed the entrance in the TotK:, making it impassable. The only way to access the location is through the TotK: that has opened directly below the castle. A cave at the base of the chasm known as TotK: leads to the ruins and tunnels that make up the passage to the TotK:.

Themes and Navigation
The TotK: appears to have had a profound impact on the area; many passageways are blocked, TotK:-built structures have entered states of extreme disrepair, and an extremely high concentration of Series: is prevalent all throughout. The TotK: has corrupted the many Series: that now inhabit the passage, turning the area Series: into a long and dangerous gauntlet to its deepest depths.

As Link gets close to the TotK:, the avatars of the TotK: (if he has received their vows) will disappear, being unable to reach Link at such extreme depths. In the central chamber of the TotK:, the rocks covering a series of murals can be blown apart to reveal three additional depictions: the final battle of the TotK: between the sages and TotK:, TotK: with the TotK:, and the TotK:. A passage descends further to the cavern in which TotK: and TotK: first encountered TotK:, now revealed as the TotK:. The ground of the chamber has since given way to a huge chasm referred to as TotK:. A tunnel at the base leads to another chasm that leads deeper still into the depths. A stone platform reaches over the void, and Link can dive from it to begin the final confrontation.

When Link reaches the base of the chasm, a large-scale war will break out with Series: forming The Demon King's Army being summoned in several waves. If Link has acquired the vows of the sages, those sages will physically appear in-person to assist him in the battle. Following the battle, a passage covered in brightly glowing, pulsing, TotK: will open and TotK:, TotK:, TotK:, TotK:, TotK:, and TotK: are summoned to confront Link. If they have not been defeated during the main quest, Link will have to face the undefeated bosses in succession before being able to proceed. If all bosses have been previously defeated, the sages will urge Link to proceed onwards while each taking on a boss and caving in the passage behind Link. At this point, the only way to move forward is to confront TotK: in the very deepest depths of TotK:, TotK:.

Minor NaN Enemiess
All enemies in this location are Gloom-Wreathed.

The Demon King's Army
Bosses that Link has not yet defeated will be challenged here in succession following the previous waves.

Trivia

 * Beneath Hyrule Castle is the deepest point in Hyrule, with the Z-axis coordinates for Gloom's Origin being -2500.
 * Gloom's Origin can only be visited during the final confrontation, though it is not possible to save the game, leave, or teleport away once this has begun.