Have them spread venereal disease when they attempt to convert villagers. Those villagers slowly start to die, and any villager that tries to collect from the same node or is garrisoned with it will also slowly start to die. But if a military unit attacks an infected villager they also die slowly and infect anyone they are garrisoned with.
Then when a bunch of your enemies villagers die, 8 out of every 10 military units you create get Montezuma's revenge and die much quicker - the blood on the dead unit graphic must then be changed to brown.
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