Hidden Ourobon - hidden entrance?
I’m not sure if we’re thinking about the same wall here but if you’re talking about the blue’ish wall up north – that’s part of a dynamic event.
It didn’t look blue to me, it’s near some oozes and further in past the ‘Help Shining Blade Kimber defeat Kol Skullsmasher’ event if that helps pinpoint the location?
I’ll hang around the area later and see if anything interesting happens though thanks.
Okay, gonna put this into a spoiler tag, just in case (It’s about the event you mentioned).
The event you were talking about later on leads you to a glowing wall past some oozes. The NPC you're trying to save in that event will open it and it'll lead into the centaur camp up north where you have to fight a few centaurs.
Now, I’m still not entirely sure if we’re talking about the same thing or not but this is all i can think of