Quote Originally Posted by danielxcutter View Post
That depends on what kind of protection Cloister provides, I guess. If it's like Mind Blank it wouldn't pick up O-Chul, yes, but it might not - and depending on how she managed to get that info, such as planar alliances with higher (or possibly off to the side, though likely not lower) beings, it might even bypass that.
It targets every single creature in the area of effect against divination, teleportation and communication magic from the outside. You need epic level magic to pierce it.