Okay, since we can't increase the percentage, let me suggest something else: Desert King - all neutral creatures belonging to the desert (e.g., gremlins) join the hero at half strength. Or simply make it so there's a 50% chance to recruit neutral creatures standing on desert tiles into your army.

Added 2 hours ago
By the way, I remembered another unpleasant drawback of the mod. Why did you have to force those ugly green numbers into it and change the original "attack results" in battles?
P.S. Why not give succubi the model of a bear, instead of these terrifying demon lord models?
P.P.S. And what is the "Death Knight bonus" for Veres? Does he get Death Knights every week, or does he simply receive Death Knights in his army after killing horses? It's slightly unclear.