Looking for a giant mushroom

I've been trying for months to find a huge mushroom that I saw a long time ago.
I was in a scene (of which I do not remember the name or the level) where I found a very large killer mushroom. It was a small watery area, surrounded by rocks. Lots of small mushrooms came out first and when I killed them all the big mushroom came out. It must have been quite large because with my level 105 archer it took me a long time to kill him.

I remember that very close there was another scene (of which I also do not remember the name and where I would also like to return) with a kobold camp where there was a building with glass walls, a switch and another large mushroom behind the glass.

Does anyone know what areas it is, please?

 

Both the kobald camp with mushroom and also the Rock/water are are in Norgard Fens.

 

One large type you can find is the Giant Conocybe Filaris. Can view that wiki page to see all these scenes that have that specific creature.

There's several other large mushrooms though.

 

Norgard Fens has a 'shroom wave battle.

 

Ruined Keep and Ruins of Ravensmoore has mushroom boss as well.

 

the big boss one is Paxillus Involutus

 

Yes! Thank you very much, I found and killed the two giant mushrooms.
With Lilith (archer with pet) it took a lot of work and I died a couple of times, but with Isabel (light armor, spear and shield) I have had no problems, despite the fact that Isabel is much smaller than Lilith.
I've always been better at melee fighting and this has been a really fun fight.
Thank you all!