The 'basic instance' is an instance using predefined Attributes (Endurance, Power, Coordination, Charisma, Intelligence, Will, Magic, Essence). It provides some background and a world. Many Actions and Quests are already defined, based these Attributes. The 'Basic instance' is a RFC-based world (i.e. created using examples coming from our RFC). You are free to use it to base your own instance on. It's easier to enhance the "basic instance" than to completely rewrite an instance. But you'll have to if you want to use completely different Attributes.