Everything about heroes.

In the Faidaen campaign, he wasn't a strong mage for me, although his knowledge is something any warlock would envy.
A warlock is strong on any map, but only with medium-sized armies: up to 5000 creatures of level 1, and the rest in decreasing order.
It's difficult for any hero to develop a super ability without a mentor.
Mass blessings are not so useful - mass curses are much better.
And do elder druids increase their hero's magic skill?

In the version with orcs, elder druids increase the hero's magic skill by the amount of the hero's knowledge.

That is, if an elf has 18 knowledge and 7 magic, then the druids increase the magic to the level of 7+18=25, and this is most likely more than the warlock has. On a large map at level 25, it is quite likely that the elf hero's magic skill will exceed 40, and now we cast a spell - a meteor shower - a rain of arrows...
The game is over.