These conches are littered all around the world, and you need all of them if you want to get that outfit for Fischl! The Day 3 Phantasmal Conch in particular is in a very long and confusing domain. As it stands, I can’t fault anyone if they miss it on their first playthrough going here.
Day 3 Phantasmal Conch Location | Genshin Impact
To begin with, you need to head to the Broken Isle. That’s the isle where you can change the height of the mountains. In the same location where you do that, you go there and select “The Island’s Stirring Strings.”
There you can enter the mirage under “Blazing Trails.” This Mirage is filled with those puzzles that use magical music notes and tuba-like plants, in fact at the start of the mirage is a musical note statue that’s locked behind some vines and branches.
Anyway, all you need to do is go through the mirage like normal. Fight the enemies, gather chests that you find, and solve the very easy mini-puzzles to progress. At one point you’ll get to this place shown in the image below:
A musical note statue, some tuba plants and a sealed chest with a clef symbol on it. You’ve probably seen this a few times already in other mirages and even on the island you started. Yes, the Broken Isle has a puzzle similar to this, and if you haven’t found it yet and want to get a total of 4 chests in one puzzle then go check this guide out: Genshin Impact: How to Open Broken Isle Locked Gate Fire Totem.
Anyway, pointing the tuba plants to the sealed chest is the easy part, so go and do that and get your reward. What we really want though is the conch in this area.
You should see on particular tuba plant pointing upwards. Aim the central tuba to that one and activate the note statue again. If done correctly it should make a short flight path, just jump into it and it should send you to a rock.
That rock contains the conch you’re looking for, congratulations! Now to just get the rest of them…wherever they are.
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