Lately, I've encountered several wizards running around stalking me and my party. We all know that nwn has limits, however, the use of invisibility is, in my opinion, becoming an issue. Players who are using Invisibility should allow others to make a Listen check to know someone is around, unless they move only during times of major sound ( like battles). If you need help determining the difficulty of detecting you, see
http://nwn.wikia.com/wiki/Invisibility. "A successful (listen) check lets a character hear an invisible creature "over there somewhere". It is practically impossible to pinpoint the location of an invisible creature. A listen check that beats the DC by 20 pinpoints the invisible creature's location.".
This annoys me in particular because my character is a Wisdom-based Ranger with maxed Listen and Spot but he still can't locate people who do no effort not to make noise. If a person wants to be completely "Invisible" to normal detecting methods, he/she should cast both an Invisibility and a Silence spell. Maybe something can be done by the developers, so you enter an "modified Stealth mode" or something similar.
Anyway, I had great fun with this people, but maybe the RP could be enhanced by Roleplaying the sound. Although as far as I know I had no experience with people using normal Stealth, so I don't know if this is an issue or not, this people should also remember that you can only use stealth if you have some decent cover or concealment or you are far away (for instance, shadows are usually enough, but not against someone with Dark or Ultra Vision).
I'm looking forward to hear other people's opinion on the matter.