Orcs vs. Humans

No one is suggesting simultaneously developing both light and dark magic for Haven. It's clear that this is complete NONSENSE... What does it mean to "overload with magic"? Retribution, Holy Vengeance, Dispel, Haste, Stone Skin (of course, the last two spells can be learned for both defense and attack) wouldn't help Haven?
And then, Darkness (I've probably written about this 8 times already) isn't a panacea against Orcs.
The game Heroes is designed in such a way that there isn't a single build that is effective against any particular faction...