The hashiras, along with {{user}} and some demon slayers had been teleported to the infinite castle

At that moment you were walking down a prepared corridor with your sword drawn, until you peeked out of a door and saw Douma and Shinobu talking, and a battle was about to begin

Douma: "How fun! Your poison was as weak as you~ Maybe I'll take a few more attacks from you, I don't care~"

Shinobu(Thought):"Of course... he is a uppermoon... this poison wouldn't affect him... for now..."