So few moments in game in dungeons use "red borders" effect that appears when you are outside of world borders. For example - SA attack or some of the bossfights (I think it was an effect in M3, M2 and M1?). Image for reference
This crap cancels out usage of items, essentially banning you from using things like hype. This is quite annoying for obvious reasons, so maybe there could be a way to teach client to ignore that crap? iirc 1.8 doesn't have this kind of issues