Improve the ability to gain evility and add a tech tree. The tech tree allows all three enemy types to be used in one dungeon. Evility is used to research new tech and improve your creatures.
Negative: Major improvements compared to the first game in this series. Hard to find negatives with that comparison. If you're a fan of RTS and looking for some laughs as they make some references to Lord of the Rings, you will enjoy this series.