I don't know what Spell was used to protect the Vey'lithar Sanctuary, but it doesn't work on me.
The way I see it, there are at least two series of Spells.
Maybe three.
One obscures this place from view, creating an illusion in its place.
The second one serves as a protective, sturdy wall that ensures nothing can get in. There could also be a third one that disorients the senses or prevents anyone from ever finding it.
I could be overthinking it, but there's also likely to be a fifth barrier to isolate the sounds, smell, and all manner of activities within the barrier from the outside world, preventing anyone from ever noticing that there are people living beyond the boundary.
I'm sure there are Anti-Divination Barriers in place, too.
How interesting…
If I weren't a Leviathan, finding this place would be impossible for sure.
