It's rarely that a hero is born a day before they head out to adventure. They did something for a while before the call to roam the land and fight its evils took hold. But what, exactly, did they do? What sort of skills did they learn along the way? That's what the Backgrounds are for in Dungeons & Dragons. But even with the couple books that have expanded backgrounds, a player might not really find one that works for the character they're trying to create. That's where the Call to Adventure book comes in. It's up on Kickstarter now and it is simply filled with new bakgrounds.
From the campaign:
The classic Hero's Journey begins with humble beginnings. This meek and predictable life is what makes the next step, the call to adventure, so terrifying. The 13 backgrounds presented in D&D's Player's Handbook cover a lot of possible backstories, but I felt that the sense of humble beginnings was missing. What if there were another thirty or more backgrounds to choose from? What if each one had a uniqueness that added flavor and personality to your player character? What if your background wasn't the thing you chose at the end of your character design, but was the life you were Called To Adventure from?
The campaign's around 4x funded, but there's just about 2 days left to get in on the action.