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Forest Ghost
Ranger Utility 22

You vanish into your surroundings with such speed and skill that your enemies can't even begin to guess where you might be.


Effect: When it is not your turn, enemies treat you as invisible if you have cover or concealment from them. An enemy still knows the square you occupy if it saw you in that square at any point during a round This effect lasts until the end of the encounter or for 5 minutes.

Forest Ghost is a daily power available to rangers at the 22nd level.[PH:111]