Auto-translated
I don't level up resistance because it's an extra five skills, and there's already a lot to learn. Plus, magic resistance isn't required in every battle and can be easily replaced with antimagic if needed.
Melee and ranged combat skills might not be necessary in themselves, but they are needed to level up combat, which significantly increases survivability, and this is relevant for a solo hero.
As for liches and vampires, you're saying something strange. You've already been told that undead and vampirism are not the same thing. A lich is simply undead, while a vampire is undead that possesses vampirism. It would be stupid to take that away from them; it contradicts the very logic of this unit.
Melee and ranged combat skills are NOT needed to level up combat. Nor are they needed to level up resistance.
A lich, or dead sorcerer, can also be translated as a leech (which sucks blood:mad: :D). But in the fourth game, a lich is not a monster or undead, as in the third game, but a hero, just like a death knight (dead knight, zombie). Although it's unlikely you'll find healing near the Necropolis, as far as I remember, its heroes don't behave like undead – their morale changes (this is for sure) and so on:smile24:
Added after 51 minutes
...knowing that the development was overseen by the Jews from Ubisoft, for whom the Heroes series has long ceased to be a priority, and they didn't have the most diligent approach to its development...
Техника в руках индейца мертва.
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html