Cursed Province

[Forrest]

Thanks. I have a death and blood mage so I'll spell it.

[Endoperez]

The most common disease site is Inkpot End. That one is always visible, even before searches. Other ones might not be visible, but will still disease troops. There are also sites that horror mark, increase unrest, etc.

[Etaoin Shrdlu]

Other diseasing sites (these from D2 so likely not complete):
Crown of Darkness (D4)-- also gives 3 D-gems, 40% THAU bonus. If you have some high-end undead mages and want to do some safe cheap thaumaturg'ing, this is the right spot for it...
Leper Fens (D1)- gives 2D
Chillsick Swamp (D1)-- gives D,N,W

[NTJedi]

If multiple diseasing magic sites exist within the same province does this increase the chances of units/commanders becoming diseased ?

I estimate only the developers would know the answer, but maybe someone will surprise us with a solid answer.

[Taqwus]

If it's an MP game, there's also the slight possibility that somebody is playing around with a stealthy disease-causing unit (ex. Black Servant w/ Bane Venom charm, or a Harvester of Sorrows). A disease-causing site is more likely, however.

If you see an independent force slowly dwindling with no apparent reason, a disease site is a pretty likely explanation. Be cautious if you rely on living troops without an easy way of curing disease.

[bananafish]

inkpot end - it's an unholy site

[Nerfix]

Death site actually, unholy sites from Dom 2 got turned into death sites.