Scripts

Martha, I apologize, I didn't pay close enough attention to what you needed... Yes, of course, it's possible. We'll add extra checks to the first function, i.e.:

function Beacon_Tilgatal_F()
 if GetObjectOwner("Dungeon_1") == 1 then
  SetObjectPosition("Port_Tilgatal", 81, 133, 0);
  sleep(1);
  print("Tilgatal Castle is ours");
  sleep(1);
else
 SetObjectPosition("Port_Tilgatal", 127, 142, 1);
 sleep(1);
 print("Tilgatal Castle is not ours");
 sleep(1);
 end;
  if GetObjectOwner("Dungeon_2") == 1 then
  SetObjectPosition("Port_Halad", 63, 104, 0);
  sleep(1);
  print("Halad Castle is ours");
  sleep(1);
else
 SetObjectPosition("Port_Halad", 127, 142, 1);
 sleep(1);
 print("Halad Castle is not ours");
 sleep(1);
end;
  if GetObjectOwner("Dungeon_3") == 1 then
  SetObjectPosition("Port_Torost", 104, 105, 0);
  sleep(1);
  print("Torost Castle is ours");
  sleep(1);
else
 SetObjectPosition("Port_Torost", 127, 142, 1);
 sleep(1);
 print("Torost Castle is not ours");
 sleep(1);
end;
end;

This check for ownership by players can be shortened to this (since you need only one player to own the Castles):

if (GetObjectOwner("Dungeon_1") ~= 1) then --If the Castle does not belong to the first player, then our authority ends here