Sieges : do I remember correctly ?

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I did some testing:

In a siege, Leprosy always hit the besieging army.

Nation A is besieging Nation B in province X.

Nation C casts Leprosy on province X: Nation A's army affected.

Nation B casts Leprosy on province X: Nation A's army affected.

And I thought this was interesting: Nation A casts Leprosy on province X: Nation A's army affected. Ouch!

I also tested Manifestation: randomly hits a commander of A or B in province X. Does not matter who cast it.

Probably it's a good idea to test if you are unsure about other spells.

[Lazy_Perfectionist]

As an aside, if I'm besieged by an enemy force, and I bring out a bane venom charm, what happens?