The program didn't launch for me. It requires framework 4. :(
Also, it doesn't take into account that the destructive beam can accumulate its effect with repeated casts.
You could add a lucky hit. You could add an option to fire a direct shot or deal melee damage with the archer.
And if you really want to make it perfect, you need to involve experts on monsters.
But overall, thank you very much for your work! If only it would launch...