Secondary skills in Heroes 3.

I mainly play as Ellazar, so:
Intelligence
Wisdom (can't do without it, of course;))
Luck
Leadership
Earth Magic
Water Magic
Air Magic
Fire Magic

But aren't heroes from Rampart given Fire Magic? I could only learn it from a university or a witch's hut. :( I got the impression that it isn't given to druids and rangers, just as Leadership isn't offered to necromancers.

My ideal set of skills:
-Wisdom (actually, I usually take a magic-oriented hero, so Wisdom is already there);
-4 elemental magics (if I have to choose, then in order of priority - Earth, Air, Water & Fire);
-Ballistics (mainly because it allows you to cast spells first during a siege; if I have the fastest units - titans or djinns, and the opponent has archangels, then the need for mass slowing is obvious... otherwise - goodbye, my archmages);
-Logistics;
-Intelligence (it's not essential for mages, but in general, it's the only one of the four skills that give bonuses to the hero's main characteristics that I take, because the spells in the 3rd game are quite expensive in terms of mana).

By the way, in the original version of the 3rd Heroes, before the expansions, it was very easy to aim the ballista so that the first shot destroyed one of the side towers. And since I don't always have resurrection, this is a significant plus.

Added 8 minutes later
Yes, and of course, for a secondary hero - Estate. Or even better - take one of the mercenaries who have a +350 gold specialization. Of course, if he also gets Estate, then that's a real golden goose. :p
And also, since I love playing as mages the most, I don't have any problems with getting a "spare" hero with the Scholar skill. Aine is the ideal spare - she has both Scholar and +350 gold.