a cheap way to conquer new cities

[King of the Ring]

play as any empire faction
take a diplomat to the target town and have an army ready with siege weapons

break alliance -> become neutral
take the city and do what you want or need to do
end the turn and the next turn , voila! your allied with the faction you took the city from

take the town in the same turn you broke your alliance because if you wait more turns you will become allied and lose the siege

[Aymarr]

Its cheating...

[GreatSword]

Someone edit a script so diplomacy works like vanilla kingdoms with the grand theogonist as the Pope!! I will give you mega $$$$

[Lord Baal]

Are you really offering money for that? I would do it then! (WARNING, I'M NOT SERIOUS, NO ONE SHOULD EVER CHARGE MONEY FOR MODDING, EVER, NOT ONLY IT WOULD BE ILLEGAL, IT WOULD BE BEYOND THE SPIRIT OF MODDING).

As Aymarr said, that's a cheap way of cheating. Try to do the same against a Chaos city to see how it goes

[King of the Ring]

note : works only for non-chaos cities