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I would like to see skeleton archers; it's a pity that there are no Dark Knights, I love them in the third part.
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In general, the most overpowered thing that necromancers have is their building for converting troops into undead. Of course, there are also abandoned mines and diplomacy with the messenger; these can also be considered overpowered under certain conditions. But raising the dead and necromancy are far from being overpowered. In terms of effectiveness, necromancy is far inferior to almost all racial skills of other races; for example, take the runes of the dwarves, training of the humans, or avenger of the elves. And the creatures of the necromancers are not of the best quality, although not the worst either.