WitcheR-L
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No, it probably won't work... Magic gives the unit the property of vampirism, but vampires already have this property (initially). It's like building the same building twice to increase the production. Although I might be wrong... but it's unlikely.
It seems to me that it works like in some RPG game when you upgrade a fireball and then upgrade it again, making it level 2! And then the percentage will increase.
