Fireball
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1-2 damage, 5 health
Just forgive me when they become 3-4 with 9 hit points.
That is, more than twice as strong as themselves.
Battle Frenzy from attack and an artifact +1 damage (sought by any decent Necromancer), and if you upgrade Ranged and Cold Steel, it's even more.
Resilience from defense and an artifact +2 health.
Necromancers are casters who pump up defense o_O
Defense status allows for effective use of dark magic.
Sorcerers + defense prevent 2-5 troops from being quickly destroyed.
That is, in the middle of a battle with Necromancers, you are already turned into a punching bag, and the Necromancer starts thinking about who to resurrect in order to minimize losses.
A prolonged battle with a Necromancer is death.
IMHO, spellcasting doesn't work. It's better to cast mass curses for half the initiative.
I just don't hear any praise about dragons.
One of the most aggressive and unpleasant 7th-tier units in all of Heroes of Might and Magic 5 when fighting against humans.
And why should we sing their praises? They don't fly over the battlefield, they hit weakly, and they die quickly. Curse, of course, is quite effective against Titans, Devils, and Emerald Dragons, but it's not always possible to use it. But against Angels, Black Dragons, and Lava Golems, they are completely useless, and they require a lot of resources. It's better to build a Guild and a couple of upgrades earlier.
everything else is mediocre.
Ghosts are mediocre??? I strongly disagree.
can a Necromancer really win a dungeon and against humans under otherwise equal conditions?
Yes, you can win with any faction. Probably, only Inferno will be a little harder. It's not very effective to fight against Necromancers (especially without removing enchantments and generally without Light Magic) with Dark Magic, and you will get a full beating from it.