Changes to the rules starting with the letter G (Graal and Galtran).

Then maybe not a random one, but rather ban picking Galtran and Tanta. You could additionally specify a tech reset if they appear in the tavern on 111.
The other heroes seem clearly weaker, right?

By analogy with Conflux — there too the other heroes are clearly weaker than the fantastic four.
It seems to me that since Luna clearly should either be banned or nerfed (by Expert Fire Magic), then the Necromancers' solutions, if any, should be symmetrical.

To avoid cluttering with new messages, I'll add:
It seems to me that the option to choose a hero in Conflux and Necro, but with a limitation on Necromancy for Galtran and Fire Magic for Luna — looks significantly better than a random hero at the start.
But then Monere, Grindan, Labetha, and Tant would remain untouched, which I don't see as criminal. Because without scrolls, Conflux players won't break a Dragon Utopia on the second week, well, and Tant — what can you do, he'll be quite strong, but not so strong as to allow a player to win a series of 10 games 75% of the time against an opponent with an objective rating +200 points higher, for example.