NHF – new heroes for Heroes V 3.1.

Only quest boxes remain. Should I summon them every day (except for the days when goblins steal gold, and if possible)?

"Except for the days": It's possible to filter out those events when the hero is far from enemy castles, for example, when there are no goblins....
I still need to think about it. Maybe move the special ability to another faction?

It's known how to find the distance between objects. But how to find the shortest one?

Is there some kind of problem with that? :) The sum of the squares of the legs is equal to the square of the hypotenuse. We calculate all the distances, check for the shortest length; it's not difficult to write a loop to find the minimum, even if Lua doesn't have a function like "min".