Yeah, Revan specifically devised some scheme with a very long incubation period, immediately visible positive effects that increase immunity (so that later a person with improved immunity would still get sick), and moreover, there will be no way to cure this infection, and healing potions/spells won't help.
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Dude, your naivety usually annoys me, but I'll be honest – this time I was actually touched.
Where do we end up when we save the world?