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Fixing Necromancers (as was done with Vidomina and Isra) is complete nonsense. It simply breaks the game. Regarding Necromancers, I think it would be reasonable to reduce the percentage of Necromancy and bring back the two named heroes. Or, alternatively, leave everything as it is.
Banning heroes is also not a solution.
Regarding random heroes, my position is this: either make all heroes random for all factions, or leave it as it is. There's no need to create new rules.
P.S. My comments about Necromancers apply not only to this tournament but in general.