Here is a save before the final battle, you can download it at the end of this article.
Master Difficulty Save
Completed the entire storyline standard campaign up to the final battle. There is one battle left and the achievement is yours.
Be careful: when loading from a save, all achievements from this run that you do not have will be loaded (probably achievements about gold, caves or other story ones)
Put files here:
Thanks to TheSpiderCrab for his excellent guide, all credits belong to his effort. if this guide helps you, please support and rate it via Steam Community. enjoy the game.