Leugren: I believe you're still thinking of stealth in previous edition (2 or 3) terms.
Yes, the creature sees me all the way, but when I reach the square at the end of my move which provides me with cover, I get to make a Stealth check, because I now have cover. If I succeed, I have combat advantage. The creature knows where I went, but he can't see me right now unless he succeeds at a Perception roll.
Again, this is the point you don't seem to be getting. Stealth is not an action by itself. It's
part of whatever action you are taking. You don't "roll for stealth" just because you happen to be behind cover. You roll when you move or attack.
Since you were exposed during your move, that move was not stealthy. You were seen.
But since you are behind cover, your attack CAN be stealthy. You make a stealth roll
that is part of your attack. If that roll is successful, then yes, you have combat advantage.
If I have this power, I am Stealthed during my entire move assuming that I succeed on my Stealth check, even though part of that move carries me across squares that afford my opponent a full line of sight to me.
Right, that's the benefit of a 10th level rogue utility power. You get to break the line of sight rule, and expose yourself during a move but still stay stealthed if you start and end behind cover.
DM: OK, now that you've scratched your ass, you can make your Stealth check; the kobolds can't see you now, so you can gain combat advantage.
No, the kobolds don't see you
scratch your ass. That has no bearing on anything else. They know you're behind the cover. You have the protection cover gives against their attacks. WHEN you attack, you then make a stealth check to see if you can do so stealthily, and so gain combat advantage.
This is the difference between 2/3 and 4:
2/3: Run behind a wall, "Hide", then move around as if you're invisible, or "move silently" and sneak up on someone.
4: Move, attack, or anything else. If you have cover/concealment, you can do a stealth check as part of the action. If you succeed
that particular action is stealthy.
The stealth check is actually considered part of that move action.
This CSR response was actually just a few days after launch, June 11. CSRs at the time were providing completely contradictory answers on stealth to player questions. Following which, if you read this thread in its entirety and the one on Gleemax
they stopped answering all stealth questions for a few days. Then they got their story straight.
The same CSR said in the following message "Remember again, you CANNOT make a stealth check without moving first. You can't call for a check without moving." which directly contradicts the PHB, and which later CSR responses showed was wrong. You can stay behind one piece of cover and make stealth attacks each round.
It's very simple. Get to cover. Roll a stealth check when you attack. If you succeed, you have combat advantage against you target. Do this each round.