It was fittingly dangerous and spooky, especially with its original music "Emerald Labyrinth".
I just went through some of my recordings and put together a short video from the old Black Shroud in case anyone wants to see what it was like to run through:
https://www.youtube.com/watch?v=lW0MJ1rHHoE
I loved the animation and weight our characters had in their movements -- you can see it when we come to pause a during our running.
At the end of the video, we probably had several dozen people together to take down a treant -- of course you couldn't see everyone, but I think there were many more people there. lol
This was back when Mog weapons were some of the strongest in the game, when Wrist Flick was a thing for stunning enemies, and the Level 99 treants could just one-shot anyone with 9999 damage.