It's okay - especially if you have houses nearby, where you can level up for money or just like that))) That way, after a battle, you get 2 or 3 vampires, or even 5 - but that's closer to level 40. And if battles happen 2 times a day, it's better for the Champions to rest. I'd like to compare 100 Champions and 300 vampires - who would win))) I think the vampires would. And if you also consider that magic doesn't work on the Champions, but it works on the vampires, and add a couple of extra bonuses like double damage and something else, then the Champions are doomed!