There are eight sealed doors located around the Lucian frontier, and behind each on slumbers a ferocious fiend that attacked the realm in ancient times. As the latter-day king, it is Noctis's royal duty to eliminate the menaces once and for all.
Menace Beneath Lucis is a sidequest in Final Fantasy XV. It becomes available by defeating the game and continuing to play into Chapter 15. The player must also collect the royal arms from the following dungeons: Costlemark Tower, Crestholm Channels, Balouve Mines, and complete the Daurell Caverns. Once these conditions have been met, one must travel to Meldacio Hunter HQ southeast of the Vesperpool to meet an elderly women named Ezma Auburnbrie sat outside the diner. She will hand Noctis the Sealbreakers Key, a mystical key used to seal away a great evil, said to be forged by a Lucian king and an Oracle of yore. The key does not carry over to New Game Plus or when using chapter select.
The daemon lurking deep within knows no single form
By neither blade of flame not lance of frost can it be torn
Such menaces have terrified the kingdom throughout time
But now they must be punished for committing wicked crimes
Should we wish to vanquish these menaces once and for all
There is but one method by which our problem can be solved
We must seal the daemons away far beneath the ground
And await the day one who can dispel the darkness is found
The sealed doors conceal a tremendous danger behind each one of them. When they were created is unknown, and whether they were all created by the same person(s), but the key to them was said to have been forged by a king and an Oracle long ago. What is known is that they were created by a king of Lucis and an Oracle in a time daemons had emerged in Lucis. The Wall is mentioned on a monolith, and if this refers to the "new Wall" rather than the Old Wall, it would give the time frame of 150 years ago at most, at least for that particular menace dungeon.
A king and an Oracle sealed beasts dubbed "menaces"—beasts too strong for them to fell—underground for the True King to eventually deal with, believing their Chosen heir to be strong enough to take on the challenge. The menace dungeons became a closely guarded secret of the royal bloodline, as the rulers greatly regret their inability to protect their realm from these monsters, only managing to contain the threat into the future. The king(s) left behind messages engraved on monoliths to the king who would one day brave the dungeons' depths.
According to Ezma, the doors were only a temporary solution and would eventually break. Knowing this, she waited for someone she thought capable of destroying the monsters behind the doors to entrust the key to them. Regis Lucis Caelum met Ezma during his journey 30 years ago. Ezma believed Regis could destroy the monsters, but due to the circumstances of his journey, he was unable to. He promised he would take the task when the war with Niflheim was over. When Niflheim decimated Insomnia, this promise was thought to be lost, but Prince Noctis, Regis's son, would end up fulfilling it unknowingly. As Noctis and his retinue scour the dungeons they learn of the past rulers' plight from the monoliths, convincing Noctis he must finish what his ancestors had started and destroy the daemons within.
The party receives eight quests to travel throughout Lucis and defeat the mini-bosses at the end of each dungeon. The Sealbreaker opens the sealed doors in eight different dungeons:
- Keycatrich Trench
- Greyshire Glacial Grotto
- Fociaugh Hollow
- Daurell Caverns
- Balouve Mines
- Steyliff Grove
- Crestholm Channels
- Costlemark Tower
Completing all eight quests rewards the player with the Hunter's Medal Treasure.
|Menace Beneath Lucis||Cleigne||Complete storyline dungeons, Balouve Mines, Crestholm Channels, Daurell Caverns and Costlemark Tower||0 EXP, Hunter Medal|
|A Menace Sleeps in Keycatrich||Keycatrich Trench||Commence "Menace Beneath Lucis"||0 EXP|
|A Menace Sleeps in Balouve||Balouve Mines||Commence "Menace Beneath Lucis"||0 EXP|
|A Menace Sleeps in Fociaugh||Fociaugh Hollow||Commence "Menace Beneath Lucis"||0 EXP|
|A Menace Sleeps in the Grotto||Greyshire Glacial Grotto||Commence "Menace Beneath Lucis"||0 EXP|
|A Menace Sleeps in Daurell Caverns||Daurell Caverns||Commence "Menace Beneath Lucis"||0 EXP|
|A Menace Sleeps in Crestholm||Crestholm Channels||Commence "Menace Beneath Lucis"||0 EXP|
|A Menace Sleeps in Costlemark||Costlemark Tower||Commence "Menace Beneath Lucis"||0 EXP|
|A Menace Sleeps in Steyliff||Steyliff Grove||Commence "Menace Beneath Lucis"||0 EXP|