Auto-translated
By the way, the immunity of golden drakes is generally useless (the only advantage is if you manage to get Armageddon). Since they are vulnerable to explosions, you can destroy them in one turn. And by the way, while you're upgrading them, a lot of time will pass; it's easier to find a Fortress on a hill.
"Никто не уходит из героев вечно", - убедился на личном опыте, гоняю в сингле до сих пор :D