Dark energy

I like the idea of dark energy for the Necropolis faction :) On one hand, 10,000 skeletons is cool, but I'd like to see more variety in other units as well. On the other hand, in Heroes of Might and Magic IV, any undead creature (except bone dragons) could be resurrected without limit, depending on the level of the "Necromancy" skill... At least until the end of the week ;) And necromancers were heavily criticized for having an unlimited number of vampires, which were already overpowered in Heroes of Might and Magic IV. So, as I see it, the dark energy system in Heroes of Might and Magic V caters to all tastes... ;) The only problem is that when I played as a necromancer (though only in the campaign :o), it lasted well for about two days... :D But then, when I resurrect a huge number of units on the first day of the week, and then go around slaughtering everyone... That's a big plus - you can gather a large number of upgraded troops without even visiting your castle ;) But the downside is that if you hire troops in a castle, where do you upgrade them to add to your army?