Necropolis versus Orcs.

For Orcs, it's not a problem; they have a morale cloak, plus leadership, plus War Cry.
And again, this is if the hero joins the battle before the Orc Chieftains and Goblins. Here, you also need to consider who has more artifacts for initiative.

When a dispute arises, mathematics comes into play, in this case, simple arithmetic.
How much morale will an Orc, say, level 35, add to his troops?
+3 from Leadership
+4-5 from artifacts (+2-3 if he wants the Dwarven Helmet)
+5 from War Cry
+2 from the hero and troops themselves
Total: 14-15 (12-13), and the requirement to spend the hero's turn every 3 rounds.
Luck will be 2-4 (0-2) at the same time.

How much will a Necromancer reduce it by:
-3 from Banshee Scream on Deirdre with a mini-set
-4-6 from artifacts
-6 from Creature Ability (CA)
Total: -13-15 Morale, -5 Luck

After offsetting each other, morale is approximately at zero, and Luck is slightly negative. And then, one attack from the Draconians (just one, Karl!) on the Cyclops, and they are guaranteed to take -5 Morale/Luck.

Moreover, it's not so critical whether the hero managed to join the battle before the first round of Shaman spells. You cast a mass haste spell, the spell wears off, and the Necromancer goes before the Goblins, casts Subjugate on the Chieftains or someone else, and the battle begins.

I tried to engage in a duel for Haggeesh, gave the Cyclops Fury, and tried to damage them with Vittorio's troops. 70% was absorbed, Haggeesh has Skilled Blood Fury, and nothing changed.

The statement about the Fury Shield nerf is not even worth discussing - 0.6 on Expert difficulty. It has been tested many times, and the information is in the manual for 3.1.
If you didn't succeed, there are 3 possibilities:
1. You are not playing on version 3.1.
2. You were relying on the estimated damage calculated by the game, and did not calculate it yourself honestly, taking into account all abilities. The game often displays inaccurate damage values. You need to calculate it yourself and then look at the log; everything is displayed correctly there.
3. You made a mistake in your calculations. No offense.

True, I'm not sure how much damage he managed to do this way, but there were 350 Draconians or a little more, and I had just over 200 Cyclops.

350 vs. 200 is almost an exponential increase. If the ratios were similar at other levels, then the Necromancer will have a very hard time in such a battle. And why it turned out that way - whether it's the map or the opponent didn't play very well - you know better. A standard, average random distribution should result in approximately 600 Draconians against 200 Cyclops; the ratios should be even worse at all other levels.