The Epic boss has insanely high health. I think when you tried to increase the boss health by 3.5% you accidentally increased it by 350% I normally finish heroic on boss events with gem usage but at 8bil Health per level 100 boss I will not be finishing it. I even thought about getting the weekly units for an extra 10% attack until I realized reducing it to 340% more doesn't help much....especially when the grand prize would drop the health down to 337% higher than the last. Please look into this and correct it ASAP if you can. Thanks,