Because 'Beholder', the boss monster of 'sewer', is a character that is difficult to use due to copyright issues, according to the Korean community I belong to.
I don't know if the perception is different overseas, but in the Korean community where I am, copyright is so strong that it was difficult to use Boss Monster in your previous asset 'Sewer'. While making the game, I was thinking a lot about what to do with Boss Monster.
It's finally settled!
(Of course, in the previous asset, Behloder looks a little different from the Behloder of D&D, but it was still difficult to use.)