Secondary skills in Heroes 3.

try adding water magic to your warrior.
for the swamp, this is not only relevant but logical.
after all, you're primarily playing for the swamp, right??;)

And what will come of that?
if you take one school of magic, then you need to take Wisdom, Intelligence, and Sorcery, which means minus three skills. What should I remove? It's not relevant for a warrior to take magic, but it's quite realistic for a mage to learn a combat skill, since combat skills don't depend on each other!
2. Moreover, you level up the hero at the very beginning, but you only build the guild somewhere in the middle; what happens if you've already taken water magic (for example), but there are no spells in the guild!!!!

P.S. it all depends on my mood; I play almost every faction except Inferno, and my favorites are Fortress, Tower, Stronghold, Necropolis.