New units in Necropolis. Discussion and selection between upgrades.

Well, I personally prefer 100% reliable abilities; you can rely on them in combat tactics, but you still have to wait for stunning effects to take place! As for the Altars of the Necropolis, I always develop one hero, while my Chigiris only gather resources and explore the map. This tactic creates its own difficulties, but it allows me to concentrate my army and develop a hero. It's better to have one killing machine than several mediocre ones. Therefore, I think it's foolish to give Necromancers to several heroes. Of course, the Altars of the Necropolis hit a bit harder, but the magic of the old tier is better (I only resurrect with the hero) + I really like the Cloud spell, and it often helps to determine the outcome of the battle!

And do you run across half the map with one hero to get reinforcements for your Castle? If your Chigiris only gather resources and explore the map... and imagine you are slowly exploring the map with them, and suddenly a group of dancers blocks your way... and you can't go any further... And further on, there's something very tempting... That's why you need the 2nd tier Necromancers. With them, even a level 1 hero can go without losses. And if he didn't have them, you wouldn't be able to attack. Therefore, it's worth giving them to heroes who explore the map. Besides, I didn't say that I develop several heroes. I also develop one, but I also have at least two level 3 heroes.
And also: The "Enemy cannot retaliate" ability is not 100% either, because there are units with infinite retaliation. So, it's 98%