Hi Rathlord, glad you like it! Yes it's using unity3d although there are a few changes that get rid of the usual telltale signs, we have a custom IBL system to make it look more interesting and work nicely with time of day. Also the weapon trail effects are a using custom effect system to make them easier to author and get the look we wanted. This interfaces with custom server tech supporting 1000 players and all the active monsters, if you find it interesting there's some more information here - http://www.pandaknifetree.com/tech/server-scalibility/