As you continue to do the Chasm Delvers you end up coming across one of these. When you do and you pick it up you can start a World Quest with Khedive the researcher from Sumeru that's funding the whole Chasm campaign. He wants you to go and find 8 more of these mushrooms. The quest is called Mycological Investigation but that's not why I decided to make a guide.
From what I found most people get this quest or realize there even is a quest when they are already deep into the Chasm Delver's quest. So the guides usually tell you to go to the Glowing Narrows. But if you're struggling or just aren't that far into the Chasm yet there's a much easier and much earlier area.
You'll need to get to the waypoint at far right in the Main Mining Area and be at the part of the quest where you're beginning to move on to the lower area. To get to that next part you'll be heading into a tunnel. But hang to the right side of it and you should find a branching point that leads to the Underground Waterway.
This area has the new enemy that you can farm without any dangers nearby.
Do a lap around the outside and you'll find your 8 mushrooms.
As a bonus the deeper part of the Underground Waterway is part of another quest dealing with the Serpent Knights. I've never had so many confirmations that Khaenri'ah is based on Nordic culture haha. More on that coming soon!
Anyway once you've gotten your 8 Starshrooms you can head back to the camp and get that quest done.
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And then comes the lore! Doing this quest is more than just about getting some primogems. It turns out Starshrooms is supposed to be a Sumeru regional specialty!
Now whether or not it'll actually be a specialty once Sumeru releases is up in the air - these things look like a "regional variant" of a normal mushroom - but it's still news about Sumeru meaning we have to be close. (And there's actually more but later for that.)
Side note: Actually they could be a specialty because you can farm them. Like I said above most guides tell you to farm the Glowing Narrows but there's more than enough in the Underground Waterway and also there's plenty all around the tunnels around the Glowing Narrows area. So this could be like getting Kazuha's specialty before Inazuma released.
Anyway normal Starshrooms don't actually fluoresce and according to Khedive they will be found in the forest. Rainforest is a known part of Sumeru's landscape.
And the reason these glow is from the Lumenstones so it ties right back to the main quest.
That's pretty cool until you think about it in real world terms and it starts to sound like the Lumenstones glow because they're radioactive lol
Anyway hope this helped some of you guys out! I definitely didn't think I'd be doing this many guides. 
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