That sounds like the next Harry Potter novel, only with more Killian and less Potter. Jokes aside, I wanted to shed a little light on an interesting new idea I had: Heart Shards. Speaking in terms of lore, Heart Shards are magical crystals (no, I know, but stay with me) created by a race of ancient elves during the Storm Age. They were designed to store information that -- one day -- their creators hoped would be passed down to younger, less wise races, like the humans. And I know, I just threw a ton of cliches in your face and said, "chew and swallow," but there's enough history here to make it a little less painful. Besides, Heartfire is a parody game. The only way it works is if I make fun of the very ideas I'm secretly rebelling against.

But enough time wasted. The really important part in all of this, is that by collecting all twelve Heart Shards, not only do you get to soak in the semi-original lore, but you unlock a secret ending. And since most probably won't go out of their way to find all twelve, and those who do likely won't tell anyone, you can feel like the ending's tailored just for you.

TL;DR:
Collect all twelve Heart Shards to unlock a secret ending.