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The issue here is different. It's quite easy for any hero to gain 5-8 levels (early levels), which means either magic of the 4th circle or a combat branch (defense + ranged attack, for example), and so on. This means the hero becomes not so much combat-ready as useful for performing specific tasks. But what's the point in a Necromancer at level 5-6 in combat?
Regarding this map. Besides, a strong Thief will quickly come for the Necromancer, and no Necromancy will save him).
And what will a strong Thief do? I haven't played much with other players, only about 5-8 times with my brother, and even then, we just saw each other's moves. It seems like he's supposed to capture my mines? But at level 5-8, his stealth will not be highly developed.