Unexpected Disease?

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Originally Posted by Illuminated One

Well a lot of my commanders in a fort have suddenly become diseased.
So, why?

I have negative supplies, but that did never bother my commanders much, even in 0-pop-provinces.
Could my poison golem be the reason? He's diseased himself...

Yes. That "Reaper" icon on your Poison Golem is exactly the same effect as a Bane Venom Charm.

I don't know what went wrong in your test. Not enough turns, maybe? Or if you've got some test map that you re-use for testing all sorts of items and units, and don't clean it up, did you leave The Chalice on someone? It'll effectively prevent disease.

[Illuminated One]

Hmm, it seems the poison golem does so. But only in a castle that's besieged.
And it still took me about 50 turns to achieve roughly the same effect as that I got during a single turn.