Interaction in Mystic Dream

The biggest part of my engine and one of the most important features is how the player interacts with both the world and the other characters and creatures within it. My system although still under development has the basics in place so that I may talk about them. Flexibility and complexity have been my key focus with this system. Players should be able to have long complicated conversations with npcs which will alter based on how the player chooses to respond. The system is controlled by lua based script files containing instructions on how characters will react, what they can say, what sorts of answers the player is permitted to reply with and how they are dealt with. My desire is for players to be able to create their own characters and script them exactly how they would like them to be even create quests using the same system.