Stealth in Heroes 4

Basic Stealth makes the hero invisible to 1st level creatures and heroes with no Scouting skill on the Adventure Map. Enemies can see the hero if they are adjacent. The hero can only hide himself, not other creatures or heroes.

Advanced Stealth makes the hero invisible to 2nd level creatures and heroes on the Adventure Map, even if the hero has Basic Scouting. The hero can be seen by 2nd level creatures and heroes with Basic Scouting if they are adjacent. The hero can only hide himself, not other creatures or heroes.

Expert Stealth makes the hero invisible to 3rd level creatures and heroes on the Adventure Map, even if they have Advanced Scouting. The hero can be seen by 3rd level creatures and heroes with Advanced Scouting if he is adjacent. The hero can only hide himself, not other creatures or heroes.

Master Stealth makes the hero invisible to all creatures and heroes on the Adventure Map, even if they have Expert Scouting. The hero can be seen by 4th level creatures and heroes with Expert Scouting if he is adjacent. The hero can only hide himself, not other creatures or heroes.

Grandmaster Stealth makes the hero invisible to all creatures and heroes on the Adventure Map, even if they have Master Scouting. The hero can be seen by heroes with Master Scouting if he is adjacent. The hero can only hide himself, not other creatures or heroes.