What are the major changes/enhancements between the original Dungeon Siege and Legends of Aranna?

Davis: The focus was on additional artificial intelligence and user interface enhancements that streamline the playing process. My favourites are the modifications to the control-groups, the attack cursor, and the voice-over acknowledgements.

We've modified the control-groups so that they don't just store the currently active slot, but they also remember which spells were in the active slots of the spellbook; this really opens up the breadth of spells for instant use, and I've found myself using a much wider variety of the spells.