Драккошка
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Well, in the upcoming battle, the computer will be incredibly slow. In the final mission, you need to gather all the artifacts with a Bard, then quickly defeat Hexis within 1-2 rounds, and then tediously but persistently eliminate his army with hypnosis, teleportation, and attacking spells.
As for leveling up, Warfare is necessary for ANY hero because it increases their survivability. If a hero has at least 60-70 armor, they won't even be approached (we're talking about the computer), or if they do start to bother him, they won't be able to take him down immediately....
And if a hero has 500 HP but almost no armor, he won't even survive the second round:)