"Turns out, after all this time, it's the Blood Demon, this old codger, stirring things up. The game system is just exploiting the 'Blood Demon' setting to milk it for all it's worth, huh?"
But on closer thought, it's not that strange. For puzzle games like this, there always needs to be a final main boss to keep the players hooked.
Many entertainment products have a similar setup.
Take the famous anime 'Detective Conan,' for instance. The main storyline revolves around the secrets of the Black Organization and the mystery of its boss lurking in the background.
It's precisely because of this main storyline that viewers' appetites are whetted.
As a result, this melodramatic anime serialized for 25 years with hardly any progress in the main storyline. The audience grew from children into aunties and uncles while the main character remained a grade-schooler, not even reaching middle school, which led to a decline in popularity among casual viewers.