DMing

Let's set the stage.

Imagine a grizzled, old Wizard, staring down from a hill.

There are a lot of excellent Dungeons & Dragons setting books out there that will give you all the details you need to run a game in their setting, and those settings (also known as campaign settings, world settings, campaign worlds and/or simply campaigns) are often excellent.

Sooner or later, someone always suggests this one.

Most people are familiar with the general idea of the badges you earn in Girl Scouts -- learn about a topic, tick a couple boxes worth of requirements, and you've got yourself a cute triangular patch to iron onto your vest or sash.