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In my opinion, it's nonsense. Firstly, you shouldn't fix what isn't broken. Such a mod would, firstly, ruin one of the game's main strengths, namely the atmosphere. Secondly, it's illogical; what's the point of Necromancers being stronger (!!!) than Liches (!)? Moreover, Heroes 2 doesn't lend itself well to modifications (as far as I know), let alone adding new factions. Overall, it's a strange, doomed, and generally terrible idea.