[quote=@Etcetera]
<Snipped quote by Multifarious>

What does it make people do?
[/quote]

They become unresponsive to external stimuli, and largely unresponsive to actions taken against them period. I'd almost describe it as zombie-like, but that's not quite what it is. They all still appear to move with a purpose, and studies showed that the corruption doesn't actually kill them, even if it may seem like they're dead. They almost exclusively seem to want to just keep everything away from the Dead Stretch to the south. They defend that place without hesitation. We can't go there, and we can't see anything there through any means of observation we have.