I have to say, I really hate this whole charade. This slow-burner hunger-games "throw em to be tribute" sort of shtick is a pain in the ass.
A socially accepted cauldron that burns up a person or two every decade, and it springs out of nowhere as if it never existed? Even if it's not well known, that's just a so bloody convenient. It's dull and annoying. It's like every thing in the entire world is trying to kill the MC, and it has to be played as if it's a mystery. What's next? A grand battle royale that chooses its participants via lucky bread draw, that the MC so happens to pick? And she finds out it's a fight to the death only 80% in? Come on.