Starcraft 2, like it's predecessor before it, has a very robust level editor that allows you, the DIY modder, to create nearly any scenario within the bounds of the Starcraft 2 engine that you could imagine. We have compiled videos on how to do all sorts of fun things with it, from making RPG's and Tower Defense games to just making you dream Starcraft 2 level. This video will teach you how to make a WoW-style RPG in the Starcraft 2 editor. It's a complex process so the video doesn't walk you through step-by-step, but instead gives an overview of the RPG that the creator made and offers tips for making one yourself.
Get the map here.