I had been chewing that idea for a while -maybe I'll make a drawing of my chars telling ancient tales-, but it never ended good.
Then, when I was hearing Michael Jackson's Thriller (so sad he died DDDX he was awesome!) and there was those verses performed by Vincent Price, and I found that inspiration that I needed and a nice-looking template.
I didn't steal it, I just edited ^^
Well, here it is: The Lionia's Curse.
Just for short, Lionias are the very evil guys in my story. And I ain't kidding in those verses: they are, literlly, the reencarnation of all the bad things humans ever did in their lives. When those sinner died, his or hers soul goes to the space -another story for later- and all the evil is left behind in Earth, and it turns into the Lionias. They actually feed in human flesh only, but normally only get time to only drink their blood. The evil in that blood keeps them alive. If they don't feed, they get weak and die, either of hunger or in a fight, too weak to resist.
Those are verses told by the Elementas through the years, as soon as they got to know better the nature of the Lionias and they exist only because of the Human race, which is ironically their only food source.

I'm dedicating this to my older little sister, , because she is very nice ^^ and endured that freaking trip with me in the Saturday, along with the longest 50 meters of all Earth XDD *only mah family understand it, I'll tell you guys later XD* It's a very fun story.