He heals quite predictably, on the 3rd turn and every 5th turn after that, simply use retrogade (or whatever it's called, switches healing with damage) on him on the right turns and watch him kill himself
I think.. not the enemy, but the difficulties.. When you beat Baron on easy way, you made it easy by just have to beat him 48.000 HP. But will you survive the Heroic Mode?
It depends what class you are. I have just completed Zone 7 with Hydraulic and got the Legend achievement. I found Captain Hunt veyr difficult due to Sonny hitting such low damage then being PWNed by the Sniper but after that it was the easiest Legend run i have ever done. Then in Zone 6 it was again very easy. Zone 7 was a bitch. The Twin Guardians was by far the most difficult ever! I had to get 1 down to 5k then keep him under Ice Wall so Felicity didn't kill him then get the 2nd one down and finally kill them. Took me about 5 trys. The fight after wasn't hard but very long as i had to wait 99 turns before i could inflict damage.
In heroic, the bloodhounds are the most difficult, if two of them hit the same person and crits, that person dies. The only way to survive is wear all vitality gear and the lava barrier.
currently i am trying to get to the corrupter so that i can prove all of your armies of n00bs moar n00by then ever but sone n00b and his armored dogs are really kicking veraduxs butt!
And, if you go with no training, it is possible to actually spoil your save by selling stuff or respeccing too much. You might decide to replay first two zones with your hydro. I did once.