If you are using MMORPG KIT for Unity and want to really spice up your monsters AI, Behavior Trees are the perfect way to do so, allowing your AI to seem fluid and responsive while allowing for a easy to visualize and edit GUI when implementing.
Within UNITY, Opsives Behavior Designer is a fantastic tool with some amazing features and great UI.
The problem though is how do you get these two assets to work together? Well this add-on is how, simple to use, no core code changes to the MMORPG kit means upgrades are as simple as I could make it, constant updates as I am using the same add-on for my own projects, and this amazing web site! What more could a person want?