Anyway, who was this man/monster? Mr Eatens? What was his betrayal? What was his destiny?
Mr. Eaten was a "Master of the Bazaar" giant cloaked bats, a race known as Curators. These particular ones have become guardians of The Bazaar. The Bazaar is a giant spired building/eldritch creature that is the focal point of the game for the most part. Mr. Eaten was betrayed by the other Masters for being a runt, essentially he was the easiest one to deceive and trap, and he was offered to a group of powerful Mayan priests in exchange for a city in Mesoamerica to be pulled down into The Neath, the giant cavern underground where the game takes place. That's the Master's schtick, they come to powerful people and offer them something in exchange for a city they want, to explain why would be more complicated. The priests really liked eating different creatures because they believed it made them more powerful, these priests wanted to eat something that would make them godlike beings, so naturally they ate Mr. Eaten, and actually did become immensely powerful. Whatever was left of Mr. Eaten after the feast was drowned in a well, buried, and anything acknowledging his existence was destroyed. Mr. Eaten was rightly so, pretty pissed about his betrayal, so his essence and pure will for revenge lives on in wells and in dreams. This lasting eldritch force is the thing that starts your journey to discover what happened to him, and what you want to do about it. Also I want to note he wasn't known as Mr. Eaten or Mr. Candles at the time, Eaten is what he is known as he is now, Candles, is what he would have been named if he wasn't killed.
I really enjoy the concept because it was intended that you do this to a character you had built up and become attached to. In a way you yourself are giving up something you care about, much like your character does in the story. The conclusion results in both you and your character getting what you wanted, resolution, but at a heavy cost. It has a sort of parallel with the diegetic and not diegetic that you rarely see elsewhere.