This quest is the first part of the first act of the "Ann from Narzissenkreus" storyline. Without delving into morality, this quest fully embodies "adventures" and "Narzissenkreus". There are many descriptions, and the words of logical eloquence are three times more, so let's immediately begin with the opening guide of this series. 

How to Get the "The Narzissenkreus Adventure" Quest

The conditions are basic: you need to have unlocked Fontaine and diving, nothing out of the ordinary. You might have caught a glimpse of where to get this quest in the previous article about hidden teleports. This is because following one of them automatically triggers this clingy quest. You can track the route via this guide in the "Fifth Hidden Teleport" section.

You'll encounter an Oceanid under the arch. 

How to Complete "The Narzissenkreus Adventure" Quest

Next, you'll need to swim towards the quest marker, deep into and along the cave's walls, until you reach the entrance to a stone gallery. Inside (and beyond in the quest), you'll face a battle with self-aware H2O offspring - prepare both mentally and with your build for some violent reeducation. 

A couple of dialogues, a cutscene, and you'll be released to explore the waterless areas around the palace. In your strolls, you'll encounter a bunch of devices shooting lasers and teleporting you back to the starting point. So, pay attention to the device placed near the path: a crystal that creates walls when hit, preventing laser hits. Timely jumps between these protective blocks will help you cover the necessary distances.

A new battle and a pinch of plot follow. 

How to Clear the Bubble Formation: First Mechanism

The path to them is activated, once again, by hitting the crystal. Streams will also appear periodically along your path, which will carry you forward. Now, you have a complex task ahead: avoid getting hit by the laser (the platform's structure itself allows you to avoid it); don't fall on your own; and reach the quest-specified point. You'll need to parkour like a mountain goat, it's inevitable (see photos).

Upon reaching the bubble fort, you need to extract a Hydrograna (beware of attacks). A small battle with a mini-boss, equal in strength to ordinary Fantasms, and the first mechanism is considered destroyed. 

How to Clear the Bubble Formation: Second Mechanism

A teleport stream will appear nearby, so use it. Activate the crystals on your path one by one to advance. 

Extract the Hydrograna and battle the Misfit - not again, but once more. 

How to Clear the Bubble Formation: Third Mechanism

Using the teleport will send you back to the ground, near the last chain of crystals. Everything's classic - dodging with structures, moving forward (up), and facing the boss. Be careful, the platform will collapse when you confiscate the core and recently built spiral stairs. 

Next, a modest return to the plot dialectics with a similarly modest sparring session with a boar in the specified location, and the quest can be considered completed. Your compensation for this soul-testing experience is a Luxurious Chest, 50 Primogems, 450 Adventure EXP, 50,000 Mora, 5 Hero's Wit books, and 4 Enhancement Ores. 

Don't rush to leave - the next quest, "The Princess and the Hero's Party," won't give you a break (although it's noticeably easier than its predecessor in the timeline). 

Good luck in completing it! Credits for the screenshots: Gaming with Abyss.