Posts from Scripts

You can only transfer data through SetGameVar, though.

There is a trigger for the end of the battle, which passes the battle index to the function. And using the battle index, you can get all the information about the destroyed creatures using GetSavedCombat.... It's in the tutorial and also on the forum, Jack of Shadows explained it (searching for GetSavedCombatArmy site:heroesworld.ru should give you results).

So, it becomes interesting, which of these will be less demanding on the map? What should be prioritized for script optimization?

If the developers aren't incompetent (which they aren't), then it's done through a trigger. Because a pending trigger doesn't execute until the corresponding event is called. And a loop constantly executes, which puts more load on the map.
In your script, in

GetSavedCombatArmyCreatureInfo( combatIndex );

you only passed 1 argument, but you also need to specify 0 as the second parameter (0 for the losing side, 1 for the winning side), and the third argument should be the index of the army slot to check. Therefore, it's better to write a loop that checks all slots.
That's why it's not working. The manual doesn't explain it very well, but as Khottabych pointed out, it was discussed on the forum.

Regarding my script, I rewrote it a bit and it started working! However, after checking the stacks and finding the first one occupied by any creature, the script complains about "Invalid creature index" and displays some number. For example, 2 (as I understand it, this is the occupied stack that was in combat with the hero). Is this a critical error? Or can I ignore it, thinking "Well, it's good enough!"? :D

The script now looks like this (everything works, print outputs the correct number of fallen enemies)

function WR_Revenge( combatIndex )
        print("Function started") --Delete
      if GetSavedCombatArmyHero( combatIndex, 1 ) == "WR" then
        print("Hero checked") 
         if GetSavedCombatArmyCreaturesCount( combatIndex, 0, 112 ) >= 1 then
        print("Creatures checked") 
         for i=0,6 do
         local revenge_target, count, died = GetSavedCombatArmyCreatureInfo( combatIndex, 0, i );
        print("Local passed") 
            if revenge_target == 112 and died >= 1 then
        print("Check for at least one angel's death passed")
               enemieskilledcounter = enemieskilledcounter + died;
               print("WR killed ", enemieskilledcounter ," angels");
            end
         end
      end
   end
end

Basically, if there are no creatures in that index, it will give you an error. I don't know of a way to catch this error other than using error hooks or pCall, so for now, just ignore it; I don't see the point in you worrying about catching errors right now. If it becomes a problem, let me know. It's annoying, but I don't know how to determine which indices contained creatures.
P.S.
Don't slots start at 1?

But perhaps it's the monsters that will work: resources and artifacts don't work.

Is it possible to respawn artifacts and resources? I know that the CreateStatic function wasn't documented, and I haven't seen any information about a resource spawner before. Does something like that exist?