About third or fourth battle in (getting hammer from broken horn). At least one hero gets one shotted by broken horn, second extremely damaged and set on fire, and almost every turn, about 4-7 new critters appear. On about 10th wave, and they just don't stop.
Is there a way to get rid of this, ameliorate it somehow, or is it just "We'll overwhelm you, and it's pure RNG luck, no strategy needed"?