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Haunting shade
Tactic from MacMark.
Undead has an amazing scout: The shade (the sacrificed acolyte). The shade cannot attack any units, but he's invisible (with the usual exceptions). The great thing about this shade is: If you let him auto-follow the enemy heroe or other enemy combat unit, you have always an eye on what your enemy is doing. In most cases your enemy won't detect you. Build a few acolytes and let them follow your enemy's different groups. Maybe let one follow a worker in his base. How amazing this really is you will only find out if you try it. It gives you one of the biggest advantages in this game money can buy: A live view of all your opponent's actions.
Disclaimer: Caution! Kids, don't try this at home!