Although generally a dishonorable practice, stealth has its uses in such situations as hunting or while scouting during a military engagement. For most samurai, however, these are necessary evils, and under any other circumstances, no honorable souls will ever dare disgrace themselves by sneaking about in the shadows like common criminals, or failing to face their opponents like true samurai would.
While concealed via Stealth, you may take Move Actions. When taking a Move Action while using Stealth, you may only make Simple Move Actions, and these only you to move a number of feet equal to your Water Ring (although Mastery Abilities can increase this significantly). The Ambush Emphasis allows you to make a Stealth (Ambush) / Agility roll, contested by an opponent's Investigation (Notice) / Perception, to gain an advantage over them during the first round of combat if they are unaware of your presence. The Spell Casting Emphasis allows you to make a Contested Roll against an opponent's Investigation (Notice) / Perception when casting a spell. If you win, they are unable to determine where the spell originated from. You lose no Honor for using Stealth (Sneaking), although other Emphases do usually result in Honor loss as normal.