you could make it a hullcatination. Althought the player that owns the map revealer can see the area that is revealed, the map revealer will be removed* when it runs out of energy. When this happens, the player that owned the map revealer won't be able to see the area where the map revealar was (unless the player has a unit there/is seeing a unit that is sharing vision).
*I think it is removed. I am not sure because I haven't botthered to run a test to see if it is removed.
LegacyWeapon: If you can not remove it, why does it fufill the condition "current player brings at least 1 unit to location x" if there is only 1 map revealer at location x?
ADDITION:
QUOTE(LegacyWeapon @ Jan 22 2005, 07:48 PM)
Yes, but you need to use the action:
Remove all map revealers for player x.
(Remove all units for player)
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QUOTE(LegacyWeapon @ Jan 23 2005, 07:53 AM)
You cannot remove it at a location. Even anywhere.
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Your posts are confuzing me LegacyWeapon. Which one do you mean is true?