Mullich should be thrown out!!! If he's from the prison, give him +1 level and send him to retirement!
Heroes like Loïnis, Coronius, Xeron (Inferno), and Ksarfax are up to you; you can ban them or leave them. There's not much point in banning Xeron if he doesn't even have mana at the start, even on Inferno, but who knows, maybe he'll end up in prison, say, at level 20 with expert Fire Magic and Intelligence, then Inferno might actually be good :smile51:! I can't say for sure here...
Regarding the Amplifier. In my opinion, it should be banned, but if not, then ban building more than one Amplifier. With two Amplifiers, for example, all Necromancers will have expert Necromancy, which will give as much as 50%!! That's just not serious...