I tried this and it didn't seem to work right. Also, if Cryptic fixes this "bug" they will also eventually introduce real illusionary walls at some point. Why wait?
Yeah, but I'm not quite sure why you would want to do that. Also, one of the things I did was to make a ghost walk through the wall to hint at its location.
It's annoying. Create a wall and then make it visible to 1 class skill. Then duplicate it and make sure it's on the exact same location as the first wall, select a different class skill for the duplicate. Do this for all the class skills and make sure they are all stacked on the same location. All classes will be able to…