The simplest solution in my opinion, which would put everything in its place.

Playing for different classes, I realized one important thing. Invisibility is the strongest and weakest thing at the same time. Using invisibility is almost useless against good players, as you are horrified in the middle of the battle (when enemy use detection potions) and realize that it is simply impossible to leave and now you will simply be killed without a single chance to survive. On the other hand, it causes a lot of inconvenience when searching for a hidden nb, because you do not understand how far the Inner light/camouflaged hunter/detection potions.

Solution? - ADD VISIBLE "DETECTION" AOE. (You can also increase the radius a little, as compensation) The simplest thing that will remove the terrible suffering of the players.