|A Thief or Ranger can use stealth, "hide in shadows", by first assuring
that they are wearing no better than studded leather armor. This
should cause the STEALTH icon, at the bottom of the screen, to become colored.
Press the STEALTH icon and the Thief or Ranger will go into stealth mode
if a saving throw is passed. Once in stealth mode, a saving throw must
be passed from time to time, to retain the stealth status. While in stealth
mode there will be a colored border around the STEALTH icon.
A Thief or Ranger leaves stealth mode if he performs any action other
than movement. This includes searching bodies, using any other thief
function (lockpick, pickpocket, etc.), attacking, using inventory items,
and apparently moving between building or dungeon levels. And finally,
a thief cannot be in both Detect Traps and Stealth mode at the same time.