I agree with this.
100% damage to ALL heroes PER death is ridiculous.
I had a huge cascade (which obviously is out of my control) which killed al 4 in one wave, all 5 of my heroes almost died, they had about 100 health each! Lesson was learned: take 2x Healers and make sure I have one activated before I kill, and then use one like C Rigard to get the HoT. Plus I did try to have the healing relic activated too, but obviously sometimes you don’t get that forever… you may just get the burn or poison, etc over and over, which is bad in this special stage.
Don’t forget, be sure when you kill the BOSSES on these, you will receive HUGE amount of damage so make sure your heroes have full health, otherwise you’re going to fail. And can you imagine failing on Hard Mode due to this special stage?
This honestly is a great idea, I don’t knock that, and it’s different and makes you think BUT it need to be reduced down to 50% damage, or at least 100% damage to 2 or 3 random heroes.