try setting "special defeat conditions"
("normal condition" is "lose all cities and all heroes")
but in general, why do you need this? what's the point of such an idea?
let the hero capture a city and live there
if the hero is an enemy, then the opposite
you need to set "special victory conditions" - "defeat a specific hero"
but keep in mind that "special victory conditions" and "special defeat conditions" do not work together!
you need to set one or the other.
I understand everything, I just wanted to implement such an idea, as in the Samaritan campaign, where you could freely live without a castle.