I have a Rogue Thief in my campaign, currently leveling up to Level 2. As per his build he has available the following power:
Fleeting Ghost Rogue Utility 2
You are stealthy and fleet of foot at the same time.
At-Will · Martial
Move Action Personal
Prerequisite: You must be trained in Stealth.
Effect: You move up to your speed and can make a Stealth check to hide. You take no penalty to the Stealth check for the movement, though you must still meet the normal requirements to hide.
Now, I know that I should do the Stealth check against the Passive Perceptions of the monsters around her, as per this question. But what other requirements, if any, are there? I couldn't find them anywhere (I only found a mention of hiding in the DM Book, in page 141).
I feel really dumb now, having found the data in both the DM Book and the Heroes Of books, under the Stealth Skill. Even though it could be better indexed (there's no mention of "hidden" anywhere), I'm turning this question to Wiki. I don't want RPG.SE to be my index to the books...