Favourite secret discovery?

Saw a thread asking about favourite questlines, so imma ask: Whats your favourite secret discovery?

My top 5 are:
1) Twain's downfall
2) Lusoco's secret library
3) Mining operation
4) Llevigar's secret library
5) Ragni's secret library

 

Ne du Valeos du Ellach

 

Probably the Mining Cessation or whatever is close to the Silent Expanse since the music goes hard

 

The library ones due to the lore inside

 

The one with the dragon on sky islands

 

Every ultimate discovery is great

 

Tough to say exactly which, so here are my picks based on certain factors:
Wowness: Ne du Valeos du Ellach
Lore meaningfulness: Mining Operation (yes ik it is revealed 80 levels later what this SD is hiding but it's great as a way to tease the SE to early-game players. I think some weaker overlevelled and unkillable mobs that are threatening might make the SD even better, @Deusphage food for thought)
Gameplay: tbh idk what to put here
Secretness: Necklace Chamber

Honorable Mentions:

• Bak'al's Destruction 2: Might as well be an Ultimate Discovery. Simple access but I think the cutscene alone makes up for it.
  
• Wynn Plains Monument: Cutscene is definitely dated (though I think the old Ragni should still stay even through a rebuild as that looks like Ragni before it truly got rebuilt and became great), but it's still really cool and the glowups made this update are also neat.
• The Twains' Downfall: Epic cutscene
• Teachings of Old: Would be a strong contender for gameplay if it wasn't so buggy
• Mark of the Meteors: Was great until 2.0 ruined it with the new Hunger of Gerts questline now making this SD irrelevant.
• The Doguns' Defeat: Epic cutscene. Ne du Valeos du Ellach is just better.
• Far Above the Clouds: The sky is an awesome area.
  
• The Fallen Protector: See Doguns' Defeat

 

food?? for me???

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new Ne du Valeos du Ellach by a landslide